I have a Z4 M Roadster ....
I bought it after selling my Edition 30 (which was rather successfully Bluefin remapped
)
I miss the Edition 30. Remapped it was quicker than the Z4M but the thing is, one is RWD with effortless power easily deployed and also makes a gorgeous noise !!
The Z4M is not too bad on petrol for what it is .... I have consistently got 24mpg which I don't think is too bad for the sort of car it is. The problem is the tank is too small so you are forever filling it up. 200-220 miles on a tank is a pain.
The suspension is hard but the car is supposed to be a sports car so I don't mind or find it too bad. The seats are very firm but actually quite good. The steering is very direct and the car is quite lively (which you should expect) but the odd thing is that I find it easy to drive for long distances without getting tired.
If you want a car with a superb engine and power everywhere then get one. It is quite quick to say the least but a remapped S3/Ed30 is at least as quick on the move.
Downsides ... te gearchange is unbelievably cr*p ..... very notchy and obstructive 1st to 2nd and 3rd to 2nd. I drove three before I bought mine and all were the same - it is a well known gripe. Tyres come in at £230 each. Oil service is about £250-300. Inspection 1 service £800 and Inspection 2 is £1100-1200. Road Tax £400+ with suitably dear insurance as oddly, some people have stuffed them big time. I am 44 and pay just under £700 with full prot NCB.
If the above hasn't put you off then go try a Coupe ..... same car as mine but obviously with a roof and really good looks .....
Hope this helps you