I just purchased the Rapids 4WD.
1. Very simple setup and GO.
2. had no issues traversing my walls, deep end, etc. Never touched steps though.
3. This thing sucked up some much. The pool was just opened from winter hibernation and I did nothing but throw this guy in. The pool floor was probably 70% clean after a 3 hour cycle. I think once it is truly clean, this thing will rock.
No issues with cord tangles, but I see they have a rotating cord detangler on it. Not sure if this is new or not.