Luckily I bought a tenacious and carried it and practiced with it and let my friends try it out. It was well made and locked up very solid and had some relief areas to close the knife and operate the liner lock easily. It has bronze washers for low friction blade operation and comes razor sharp.
I decided that I would like a larger version of the same knife... and ordered a resilience for myself. The only difference is that the resilience has a shiny metal blade and the tenacious is black coated which looks very nice and seems to protect the blade well. The resilience is a 4 1/4 inch blade and I like that size a lot more... plus I feel the blade is just more useful in a defense role.. it's not a tiny knife and it may be too much knife for some people to carry comfortably , but for me it is a perfect fit.
I have used both knives for a couple months and both blades are still quite sharp and have held up to daily carry without any issues. I think the tenacious was 50 dollars or so and the resilience was 60 dollars. Blade HQ was my source for a limited edition Camo tenacious , and Amazon was where I got my resilience knife.
These are made in China of good but not great quality steel and the Q C looks very good. CR13MOV is the blade steel. Gymping is excellent and the G 10 panels give moderate grip, but are smooth enough not to destroy your pockets.
I don't know about the higher priced spyderco knives. I have never even handled one, but their lower priced knives ( my most expensive knives) are pretty good and have earned primary placement in my pocket every day. I have a lot of Emerson and kershaw knives.. and some ken onion designs... a LOT of them... but the spyderco has made me a believer...
I would love to read a review of a much more expensive spyderco knife... but not a collectible... I want to read about people using them every day for EDC and defensive use...
I may at some point throw a much smaller and cheaper kershaw in my other pocket to use for cardboard and junky use... but I have used the spyderco for cutting hundreds of pieces of line for my boats and many car and airplane related maintainance chores and I have been impressed. Scott