I've just picked up a used (!) B8 A4 2.0TDI SE. I'll not be too specific about the details, but it was apparently a customer order that was correct, apart from the colour. Needless to say, I got a good price reduction from list price for less than 1500 miles on the clock.
The good? Nice interior (after an 8P A3 and a B6 A4), nice engine (much smoother than the 2.0TDI 170 on my old A3), comfortable ride (what?! I'm an old man - I tried an S-line and nearly cracked something) and plenty of toys (GSM prep, leather and cruise control above the SE spec.) The new 6-speed manual box is very nice, too.
The bad? The engine lacks some of the poke of the 2.0TDI 170 (obviously!) and I'm not convinced it's as torquey as the 2.0TDI 140. It's much more like a petrol engine in general driveability. As mentioned previously, there's a definite issue with the positioning of the clutch pedal and the driver's footrest; I've found that moving your leg over to the right and twisting your ankle to the left helps, or lifting your heel off the floor and "pointing" your foot. I've got used to it fairly quickly - I just think it's a bit "different" to previous Audi pedal layouts.