I dig the shit out of my 6u shallow Gator. Downsides were that the rivets on the bottom scratched the top of my cab
I put electrical tape over it so it wouldn't do that anymore. Also, the latches are on the case, not the lid itself, so you had to be careful taking the lids off, since they'd fall off when you undid the latches. It was really nice to carry though since there wasn't like 6" of empty space on the rear of the case throwing off weight distribution. That with my solid state power amp and my Axe made a really nice light weight rig.
I'm using an SKB 8u now, I bought it used with the rack nuts, which is a system I'm not too fond of. I prefer the threaded rails since moving the nuts to different holes on the sides was a pain. Other than that, it seems sturdy and the bottom has little feet so the metal part isn't scratching my cab.