My pre-FL FR TFSI DSG went funny outside of warranty - the dealer I took it to claimed there wasn't a
problem so I was very happy to part-ex it with them for a (manual) Ecomotive.
I loved the DSG when it was behaving itself, though. It really is a revelation as rllmuk says. The S mode especially is a hoot as it not only changes down sooner and keeps in
lower gears for longer, but it actually makes the accelerator pedal more sensitive... a *lot* of fun to blast past tractors etc!
I agree with rllmuk about the accidental braking thing when you first pick it up. In fact, my FR's supplier actually advised me to keep my left foot pulled back against the front of the seat for the first few journeys after I admitted it was the first auto car I'd bought...
However, given my personal experience of a DSG gearbox starting to misbehave, I would only ever have another one if it was 100% covered by warranty - either from SEAT themselves or a third party. It's just too expensive a failure to contemplate having to foot the bill for yourself.
In the US, where consumers are aware of phrases such as 'class action' and 'lemon law', VW have extended the warranty on their new DSG boxes to 10 years... but until that happens here, you need to look towards extended/third-party warranties to give you any piece of mind.
First thing to do it take a test drive to see whether you're even interested in the different style of driving that DSGs give.
Then, once you decide you want one, read this to find out why you will need to get an extended or third party warranty:
http://www.dsgproblems.co.uk/