Owning two, and currently in the build process with one, I can say that, yes they are not the thickest steel around (read: antec).
However, once you get everything in, they are sturdy enough for my purposes.
Advantages: 120mm front and back (though the front will only hold a 25mm depth fan, not a 38mm), motherboard tray, and sideways HD installation (nice for routing cables along the back, PRICE!
Disadvantages: thin construction, somewhat flimsy front door (I just take them off, anyway).
my 0.0002cents.
It seems, between RadioShack and Fry's that they have about a bazillion Ultra products they are trying to cram down our throats with rebate's up the wazoo.....