I have another of these crates, and while the overall wire is not at the gauge of the double door crates of this size, the front and rear panels are of the thicker gauge.  The sides, bottom and top are just fine, and also, having no tray is not a problem.  I just got a nice thick utility mat from my local hardware store that measures the same as the floor, and there is now a good, solid, padded floor; better than the expensive tray.

Pros: Easy assembly, and plenty strong enough for my Great Danes.
Cons: No problems at all.