I'm a TM user, and I'm happy with the product, but there are some areas that could use improvement. First, there's undo. Undo in TM is letter-by-letter. That makes it pretty useless for moving very far back in to history. Then there's any kind of intelligent auto-completion. Auto-complete in TM is as rudimentary as it gets. It's basically word matching for the current document, or from a bundle.

I still think TM is the best editor for me, and I'd happily use it for the next 25 years without a single gripe if I had to, but I'm not sure the editor community is going to just sit around while TM stagnates.