Had a go in one today. Looked absolutely stunning in Frozen White with the Style Pack. Driving wise, well the engine is pretty good for a 1.6T. Absolutely stunning amount of torque from what is essentially 1000rpm. Doesn't really seem to get much faster through the rev range, feels a little diesel-y if you will. Didn't manage to get on to any decent A or B roads, but it passed the roundabout test. I think the ESP was on the normal mode, but the rear end still felt pretty playful even at 30mph round a tight roundabout!
BUT I didn't like the gearshift (felt plasticky), didn't like the steering (too light, no feel), didn't like the feel of the brake pedal (felt pretty much on or off), didn't like the seat (started to hurt the small of my back by the end), didn't like the no cruise control (I rely on this with all the speed cameras around here). Got in my Clio to drive home and it wasn't a hard decision - I'll spend £200 extra on fuel a month rather than getting an ST on finance!
It'll no doubt be a great buy in two years, depending on how much it depreciates.