They won't hold value. Especially the base models. They're cool cars but they're not the best looking. On the road it's like "OK" but as soon as you park one next to a real exotic it falls flat quick.
I don't see anyone else building amg, m, or rs alternatives other than cadillac. Japan has pretty much given up on a true performance line. F was the closest lexus had but they just keep stuffing the 5.0 v8 from 2007 in everything.
Rs3 is fast as hell but looks like a chode. Imo the audi designs don't start looking good until you go as big as a6. The ct4 does the small luxury car right by not looking too small. Go Cadillac.