NONE of the so called 'issues' reported are insolvable Somniac: the brake squeal issue is/was pathetic with Audi eventually solving the issue with a 'Panzer', anyway, all cars will/should have been 'upgraded' free of charge to the owner/user.
We're now changing a front offside wheel-arch duct that's really givin' me a headache as to the reasons why - and if Martin Sander hadn't escaped to the US I'd be on his back asking...
What other problems are there? NONE! The only ongoing issues are tyres, and that depending on use: some change to a different manufacturer (Goodyear F1) with good feedback, others REALLY don't!
Me and mine are still with the original Continentals and we're content.
Go buy an RS3 Somniac and then take it to a 'reputable' Audi dealer and have them check the upgrades applicable/available for whichever car you purchase...
THEN GO enjoy a fabulous motorcar...
Oh, there's a squeaky passenger seat for those with 'racing' style seats, but there's an Audi update for that too.
I'm in Staffordshire, feel free to come and talk Audi RS3 whenever, I'm sure others here will offer the same.