Review
The S60 T8 R-Design "RD" (Sports Trim) is an understated car. It's difficult to visually differentiate it from the rest of the other new S60 RD (eg T4 / T5) aside from the badge.

With 'normal' driving, one can go up to 50km of guilt-free pure electric driving. To change lane easily while being 'blocked' by the vehicle on the side, one can make use of the 402bhp readily on demand.
(315bhp/400nm supercharger and turbocharger 4 cyl 2.0L petrol engine boosted by 46bhp/150nm CISG electric motor powering the front wheels thru' 8 speed Aisin torque converter + 87 bhp/240nm electric motor powering the rear wheels 'directly')

Combined, I've averaged 2.2L/100km (or 45km/L) for the last 7500km.
However, factoring the electric charging costs, the combined energy costs (fuel + electricity) is equivalent to about 21-22km/L of fuel costs on average. This is with frequent charging.

Comfort wise, the seats provide plenty of support for long distance driving. One can have memory electric seats for both driver and front passenger, and there is 4 way lumbar support and thigh extension support. The engine noise is muted and non-intrusive, thanks to the active noise cancellation feature. In electric mode (especially when stationary), there is enhanced refinement and serenity due to the lack of vibration and noise from the idling engine. When stretched, one can hear the soft symphony of electric motor whine, coupled with supercharger whine and turbocharger whoosh. The 600+ kW premium Harmon Kardon sound system further drowns any residual noise with its powerful and immersive audio output. The suspension setup is reasonably comfortable for a car in this class.

Handling wise, it offers one of the best balance between comfort and handling for a Volvo. It inspires confidence around the bends in its own way, largely due to its front double wishbone suspension set up. It's not going to drive like a BMW 3 Series and it's not designed to be so anyway.

Space wise, legroom is comparable to the 2007-2015 Volvo S80. This is definitely a step up over the previous S60s. It is one of the largest in its class.

Overall, a very good package for someone who needs the 'greenness', the power, the comfort, the passenger space and the confidence for the occasional fun.

What I like
Understated split personality - Good Fuel Economy while having instant and powerful acceleration on demand.

No need to worry about range anxiety when driving to Malaysia. Fuel Tank still the same size as regular S60s (60L) for no compromises in long distance driving range (unlike other brands which shrink their fuel tank size to fit the electric motor/batteries).

To further improve fuel economy for driving distance beyond the electric range of the battery (eg more than 40-50km), one can select to 'hold/charge' the battery (which turns on the petrol engine) when the car is cruising on highway where fuel economy is the best, and reserve the electric battery for start stop traffic where fuel economy is the worst.

Handsome looks

Can 'idle' electrically for hours (with Aircon on and loud music playing) without worrying about being 'summon' by NEA enforcement officers.

Suites of safety features:
(safety: collision warning with full auto brake / steering assist for vehicles, cyclists, pedestrians and large animals; blindspot warning and steering assist; front and rear cross traffic alert and auto braking; 360 degree camera)

Comfortable and insulated/refined cabin suitable for long distance and relaxed drives

Confident handling for occasional (safe) funs around the bends

Large passenger space for 4 adults in its class

Comes with electronic AWD feature for instant traction

Rather large sunroof (almost like a mini panoramic roof) for an airy interior

Lovely Harmon Kardon sounds system

Clear and sharp 360 camera

Comes with pedal shifters

Memory electric seats for driver and front passengers. Front passenger seat can be adjusted from driver side.

Rear seat benches are contoured and comfortable for rear adult passengers

Rear aircon vents are on the B (or middle) pillar, so that it won't get blocked by the knees of passengers sitting in the middle rear seat.

Very techie and minimalist/clean interior design. Materials used also feel 'upmarket' at most easy to see/touch places.

What I do not like
Lack of electric folding rear seats (can fold manually from boot area)

Lack of Head up Display (can still live without)

Lack of Polestar optimisation tune to up power to 415 bhp without compromising on warranty or rated fuel economy (hopefully it comes soon)

Rather high purchase price (at least on the surface). If one factors the higher OMV/ARF ($58k & $79k respectively) and the fuel/energy cost savings of approx 60%, this car pricing may be reasonable for some.

Potentially complex electronics and battery maintenance to look out for (keeping fingers crossed)

Requires frequent charging and at least 3 hours charging duration each time to maximise the energy efficiency potential of the car. The car has a small 11.6 kWh battery (average electric range of 40km) and supports only slow charging (up to 3.7 kW).

- Side info -

Buyers of Plug-in Hybrid Electric Vehicle (PHEV) in general, not just S60 T8, need to be able to charge their car frequently and fully to maximise their vehicles' energy efficiency potential. Otherwise, the petrol engine will work like a 'normal' hybrid vehicle and also has to drag the weight of the 'larger and not so useful' batteries and electric motors. There will still be fuel savings overall without charging, but the fuel savings are marginal and may not justify the higher cost of buying the car.

Otherwise, one should consider the mild hybrid electric vehicles (MHEV) or 'normal hybrid vehicles' which uses much lighter batteries and electric motors. These motors help to complement engine power output when its fuel efficiency is at its worst, and overall can save up to 20% fuel costs (MHEVs will likely be priced similar to its regular petrol versions for Volvo). MHEV is also useful for those who may have range anxiety (ie drive to Malaysia often).

For those who do not drive to Malaysia can consider the full electric vehicle (or Battery Electric Vehicle "BEV"). These vehicles have larger batteries that last hundreds of KM, while supporting 'fast/rapid' charging that allows charging time (up to 80% of its capacity) of less than an hour at suitable public charging stations. While BEV is more expensive, the energy cost savings is also huge (up to 80+% savings).

Other EV Volvos:
PHEV: XC60 T8 RD

(coming soon rumoured):
PHEVs: XC60 T8 Polestar Engr & XC90 T8
BEV: XC40 P8
MHEV: All remaining range of Volvo from MY2021 eg S60 B4, XC60