I've got two Trident Knives. A TC-01 and a TCFM-02. All are handmade and very very solid knives. All of his knives do have a warranty. Basically, if you have a problem with a Trident knife, you call Maciej on the phone, and he'll fix it however you want it fixed. At least this has been my experience with Trident.
All that said, I'm not great reviewer or anything, but I'll tell you that I love my Trident knives and have done things with them that I wouldn't think about trying with my other high dollar knives. (Split rocks, chopped down small trees, hammered, etc...)
I'm positive that Maciej would answer any questions you've got if you dropped him an e-mail.