I put an inquiry on the boards at thru-hiker.com and recieved the following response from AYCE:
The pots themselves are quite good. Basically they're exactly the same as the aluminum pots but made out of a thinner thickness of titanium.
The frying pan/lid, though, is a little problematic. Because of the 'scorch' problem with thin thicknesses of titanium, Trangia chose to make it thick. This eliminates the weight advantage of titanium, though it does solve the 'scorch' problem.
If it were me, I'd go with the titanium pots and stick with the stock aluminum lid/frying pan. The aluminum lid should snap onto the titanium replacement pots just as it did on the stock pot."