The thin bottom turned me off too, but I haven't had any problems yet. After 15 or so batches, I still love it. After every few batches I clean the inside with some Barkeeper's Friend, and she's as good as new.
I particularly love the ease of cleaning with all of the components. The sight glass is so easily removed, and the dip tube snaps into place without any tools.
Primary - Bluebird Bitter, Negra Modelo
Secondary - Flanders Red
Drinking - Independence Pale Ale V1.0, Trappist Style Dubbel, Dunkelweizen, Saison, Fat Tire, SNPA
Conditioning - Chimay Red, Imperial American Pale Ale, Independence Pale Ale V2.0, Belgian Wit
Kegged - Bluebird Bitter