I have an Airport Ninja.
I chose the Ninja because it looked to be the only bag that genuinely met the size restriction. The other "systems" I looked hard at all seemed to require that you "controlled" the way the odd trapezoidal case was measured. So the Ninja looked far more likely to pass the linear size restriction unremarked.
The downside is that you have to remove the fork from the bike in order to get it to fit in the bag.
Re. protecting wheels. I figure that the bag does as good a job at this as any other soft sided bag. Nothing is perfect. If one was bound and determined to bash up you bike, it could be done. I've only taken one bike trip with it. I was very careful about packing it. I removed the rear dropouts and put in a brace to support the rear triangle from being crushed. I put big plastic things on the wheel axles so that they didn't get tempted to poke out thru the bag. I also strategically put bubble wrap around frame members.
I'm comfortable that my 180lbs, standing on the bike, wouldn't have hurt anything.
I asked about my Ninja being done in camouflage so, to my surprise, they did that for me at no cost. With a recent haircut, and radiating the typical hide-your-womenfolk charisma of that group, I am assumed to be active duty military with the usual big bags, and waved on thru.
Books @ Amazon "If only he had used his genius for niceness, instead of Evil." M. Smart