So to answer a few questions... So far it has been reliable. I have actually had 2. I started with a 4S and at the time there was a massive chip shortage then the waits went up to >1 year so I put down a deposit on a second one. Couldn't get a 4S in a sensible timescale so ordered a Turbo. My thinking was that there would be little or no depreciation. I was correct - only 5k in 10 months. Now of course is a different story and my current plan is to keep the Turbo for a long time. Bought through a limited company so the depreciation is tax free. Over 5-6 years it will still be a lot of money but more palatable than a short term exchange at the moment.
My heater works fine although I accept it could pack up. As per the loaner described, my screens occasionally go blank and re-boot. In the past it has periodically forgotten my radio favourites but that bug seems to have been sorted now. There are a few quirks, but so far nothing has stopped it driving. The 4S did spend some time getting a communication issue sorted out. I think it eventually had an electronic bit unplugged to reset it.
Both cars have been fantastic to drive. If you spend some time on the Taycan forum you will see that the RWD is probably software limited and a lot slower than the others. The 4S drops the 0-62 down to 4 seconds (I think RWD is 5.4) and Turbo down to 3.2.
Currently the 4S I sold has caught up the depreciation I never had and the difference between my old 4S and the Turbo remains the same as the difference between the new purchase prices (Autotrader figures). I suspect this is because I had to add £15k extras to the 4S but only £5k to the Turbo to get the same spec due to the standard Turbo spec being higher. Also got various extras that I didn't spec on the 4S. Like warp speed acceleration
I have to say that the cars are just awesome to drive. They are not going to handle as well as a 911 due to their weight, but the responsiveness is like driving around with the sport response button pressed all of the time. And when you want it to go, it really goes.
I do think that the whole electric thing is not quite ready for everyone yet, but since I do relatively few long journeys and have charging at home it is great for my use. The 4 seats are good as I can take people in the car easily. I recently went to Liverpool for a meeting - 3 of us went up and stayed for a few days and 4 came back in the car, no problems. There were strict instructions to limit luggage size though!
Now I have moved to a night time EV tariff the charging costs have dropped to ~3p/mile and it is easy to plug in at home. My charger is set to connect overnight and it works well.
I have no regrets buying either Taycan. If you think the electric could work for you then there are probably quite a lot of 1-2 year old cars around at a very good price. I doubt you would regret it!