I recently bought one of the new BPL TI pots just to satisfy my curiosity and to use up my year-end coupon. It seems really nice -except- that the lid fits a little too tightly for my liking. I would go so far as to say it doesn't fit at all. Now I'll probably ditch the lid altogether and go with a piece of foil, but I think the ID of the lip of the lid needs to be just a tad smaller.
I will say that I have beat the tar out of my TI pots over the years and have never had a durability problem with them. Even the welded pieces have never come apart. I don't buy nonstick stuff so I can't say how nonstick TI cookware performs.
However, recently I have mostly been using the Fosters can Esbit stove combination.
On edit I'll add that I have put my TI pots right on the coals of a fire on many occasions to boil water. I have never had a pot warp. I am not sure if this is typical but that's my experience. I bet if the TI got thin enough this could be an issue but I don't know that for sure
I'll also add that it is my understanding that the link between alzheimer's and aluminum cookware is an urban myth. I'll see if I can find a reference.