I have a T3 Auto since August 2020 and I have few complaints. It's certainly not underpowered, acceleration from standstill more than enough for me, overtaking on motorways not a problem at all. I wish it were more refined and quiet though. Not a big problem.
Oh and fuel consumption in city traffic is really high. Might be a concern, especially if you do mostly short distances. Mine does not have the mild hybrid tech, so newer models might be a bit better on that front. Economy on country roads and motorways are fine. Pretty good actually.
Have I made the right choice choosing the T3 8 speed auto?
The BMW M12 turbo F1 engine of the eighties made 1400 bhp in qualifying trim. Being 1.5 litres it equated to 933 bhp per litre.
https://en.wikipedia.org/wiki/BMW_M12?wprov=sfti1
https://en.wikipedia.org/wiki/BMW_M12?wprov=sfti1