I have to admit, I have just been in Germany for a week and had a "320d Modern" new shaped one and thought the tech was good ish, hated using the iDrive which is what I think its called (more likely to have an accident than find what you want)(SOOO many options). The huds up display was brill for Sat nav directions (looks like it was on the end of the bonnet in the windscreen), speed limits your speed e.t.c and cruise control information.
BUT... the dash is so hard and plastic the fake wood was dire, the steering was dreadful, the start/stop a nightmare didn't even want to turn off properly. It was an auto so you pull into a parking space and just as you are about to let it creep a little futher into the space it stops (i.e. it kills the engine). The information (mpg, av speed, cruise, miles to empty) can be displayed on the nav screen on the huds up display on the dash clocks display, which when the steering wheel is fully up you cant see all of it. Too many choices and buttons arrggghh. The diesel engine was also sounding like a tractor, I thought modern diesels weren't like that (brings the GTD into top of the class).
It returned 48mpg in the 170 miles that I drove it and it certainly didnt feel as fast as my GTD even though it has 181bhp and 0-60 in 7.4
I certainly won't buy one of them and if the one series is anyway like it, not a chance in hell.
