I'm a pilot for a jet charter company (learjets) and finally decided to ditch my old case and get a Travelpro Crew bag.

I was tossing between the Crew 7 (22") and the Crew 8 (22") and I was very surprised to notice that

a) the anti-tip legs are gone from the 8;
b) the wheels are not protected (I smash my bags around quite a bit as you can imagine) on the 8;
c) very important to me: the rear pocket is gone on the 8!! This is important for me because it's ultra easy to store trip sheets and itineraries, receipts, etc in that pocket.
d) the "hook" attachment on the top of the case, where you can hang another bag, is a cheap snap-like affair (kind of like how the suiter clips are constructed) on the 8 while on the 7 it is a bonafide hook that doesn't look like it will break quickly.
e) the Crew 7 is 1 pound heavier than the Crew 8 for substantially the same bag...difference may be attributed to wheel guards missing, handle different, more square frame as opposed to the 8's slightly rounded look...look closely at the interior!, and maybe the 8 has less material and is less sturdy? I don't know.....

Just my $.02

I went with the Crew 7 (22") and got a super deal from a local guy (I live 10 miles from the headquarters in Boca Raton, Florida and this shop buys a bunch of stuff from travelpro with no shipping since he just puts it in his car and can massively discount) and I bought a Crew 8 rolling tote for my computer, electronics, etc, which fits very nicely strapped to the top of the 22" bag.