I began using Mustad hooks years ago, and never had a problem.
All sizes and types. I began using Tiemco hooks in much smaller quantities about 9-10 years ago, and they're fine. When Mustad announced they were dropping the classic hooks, I bought up as many as possible, but have used almost all of them. The Mustad Signature works dandy, and the micro barb is easier crimp down. I use the Signatures down to #22, and have never had any Mustad hook break (out of thousands). I did have a few that had mucked eyes from the factory, but less than 5. I do not believe I've ever missed a strike because a hook, whatever brand, was not sharp. I test my hooks for sharpness before they go into the vise, and after each fish and snag. A quality hook hone hangs from my vest at all times.
Here's my issue with hook brands. A Tiemco 100 is longer than a Mustad (classic or Signature) in the same stated size. The Mustad Signature hooks have a much wider gap than the classic Mustads,and that's an improvement, but I don't know that there is an industry standard for hook size. When someone says "They're
taking #18 BWO's," do they mean a Mustad Classic #18, or a Tiemco 100 #18? They're is a big enough difference in the two brands that I'd consider the Tiemco #18 to be very close to the Mustad #16. When using small BWO's, I haven't found that trout refuse one size while taking the other, but I know people who believe that size does matter.
I use a Tiemco standard nymph hook in size #6 for foam hoppers and Madame X's. That hook will stay sharp for an entire season, even with snags. Sort of remarkable, and I have a collection of them. I often use theh foam hopper as an indicator or hopper/dropper, and snag them quite bit. I'm always amazed at how resistant they are to dulling.