I have the International spinner

1) To date no problems on UA, AS, HU, AC, WN, MU, DL, I have managed this in some regionals as well no problem
2) Can't say needed anything going on year 2. I think it has seen 29 international and something like 120 segments, dragged thru the airport, thru sub-ways and cobbled/bricked side walks. Wheels are well worn but still going good as is everything else, still tight after all that.
3) Handle no issue, have even lifted fully loaded and backpack on it with no issues, more than 40lbs multiple times, no issue.
4) Tip over, yup, I think this is a weakness for the spinner. If the wheels are rotated in, it will tip, rotated out, no problem.
5) BR is heavy, it is pricey,. I rather like it, but if I had to do it all over, not sure if I'd have just picked up a Costco and gone thru three of them. The one pet peeve is the flat design means the handle is outside and thus you have a pocket and some wasted space, every cubic inch is valuable. I'd almost prefer the handle was internal and had a bump but then a few extra cubic cm for rolled socks / underwear or other stuff.