I totally agree with those who are waiting until the finished car is available to try.
Although I love the S1 Aero I'm glad I have an S3 overall, and don't have to worry about too many issues with the car...
I bought an M3W before they were in production, ended up with number 350 and it still has many issues that shouldn't be there but are. I'm afraid I won't be doing that again until the factory shows that they test things carefully. And after 106 years or whatever I doubt they're going to change anytime soon (and probably can't afford the sort of testing required).
Interesting to hear the front end of the new car is an improvement - I find this pretty good on my S3 anyway - so keen to understand what's better...?