Drove the G70 For over a week as a loaner while my G80 was in the garage getting fixed.
Things I liked:
-Lane Keep assist, is way better at staying in the lane without constant nudging of the steering 
wheel. I was able to take my hands off for quite some time on the prairie roads.
Things I don't like:
-Leg room, is horrifically limited
-Seats, are really uncomfortable for any lengthy drives (I did 11 hrs straight)... wife said the back seats were way more comfortable, and the kid was upset that she gave up the better seat
- wind noise, was louder than I'm use too
- clicking in the steering 
wheel, every time you centre the steering 
wheel from a left movement it clicks.
- smell of burning rubber, have no idea what that is about, but concerning
- Auto stop/ start feature, very aggressive and jarring at times 
- Unknown Stopping, driving on the highway and twice in the same session the car starting stopping as I was passing a car in the slow lane no traffic in front of me. Tried replicating on my own and couldn't figure out why the car wanted to stop on its own out of the blue.