I have dealt with this first hand with my customers and quite honestly guys we have a lot of different ideas of what the perfect knife is. I have had guys send back knives for to loose of a detent and to tight of a detent, so they are perfect if you send them to the right two guys in the first place or you have to swap them , then they are perfect. I could probably resell nearly every knife that has been returned to a different customer and they would be happy as a clam. Not everybody likes early lockup, I have had knives returned for too early lockup and I just shake my head and send them one that has 65 % and they are delighted. As far as opening with thumb studs is concerned, that all changes with use and learning to keep your fingers off the lock bar and other tricks. With all that said they are awesome knives and you should buy from a dealer that will look at the knife before it ships, if you are anal and you know it, tell the dealer you are and be specific about what you want, this would stop a lot of unnecessary returns I do believe.