Whadda you want to know??
A lease deal is slightly different to a PCP from BMW, but both are viable prospects to get you in a good car for not a lot of money. There's a pukka BMW dealer on BabyBMW cutting deals of around 15% off list. I thought I did well with 10% and a free servicing pack 12 months ago (but then I did get in before the price rise).
The looks I've kind of got used to, I can't say its pretty, but it does look better in the metal. The interior is better than a MK7 Golf and not quite as nice as a new A3... as you'd kind of expect really.
Standard equipment is very high: leather, xenons, all the electronics, big Brembos all round. The engine puts out around 340hp out of the box, many have been tested now. The chassis is completely bespoke to the car from M-division (hence the M135i badge) - shocks/springs/arbs/wishbones/hubs/bushes, as is the eLSD, stability settings etc etc. It isn't just an M-Sport with a bigger engine. Oh, and that engine is a peach!
It drives outstandingly, backed up by every respected motoring journo's reviews. I couldn't be happier with mine.
Cons:
It has an incredibly quick rack (2turns lock to lock) but it's ePAS. Lacks a bit of feel, but is direct enough.
Whilst very light on fuel when it needs to be, it'll rinse through it when you're 'on' it.