I have the Crew 9 20 in. I've done about 10-15 domestic trips and a couple of Int'l trips. Overall, I'm pretty happy with it. I had a certain price point when I purchased the bag and it met my criteria.
The bag will have the tendency to tip if you put a laptop in the front pockets, which I don't do anymore. I don't really care for the smallest front pocket.
I do like the handle, it is very sturdy (so far). I typically don't put another bag on top, so can't really address that.
It's been on a 737, 777 (fit's sideways on UAL), A320,A330, A340 and fits nicely in the overhead bins.