I use my knives for work mostly, I started with very cheap knives and broke a lot of them. (Many from user error.
) Then I found kershaw and fell in love with the with the one handed speed safe assisted opening. I am not trying to bash kershaw I still think they are great knives for the price. (some models much better than others) But most kershaws would last me 6 months before needing completely replaced. The pocket clips broke and got loose all the time, and the assisted opening springs broke. I had my fair share of other issues to. I will say kershaw did an amazing job on warrantying there blades! But after I broke the 2nd warranty knife I didn't feel right going back to them to asking for another and just bought a new one.
After the clip came off the new one a few weeks later, I decided to try something of higher quality with the hope that it would last longer and cost me less than buying multiple cheap knives in the long run. If a quality knife that does not need sharpened as much can last me 3 years I would brake even on the money. (as well as not having to resharpen every week.) I was looking for a bigger knife and I liked that spyderco was made in the USA and that the manix 2XL had 3 screws in the pocket clip.
I was not sold on the design at the time, but the more I use it the more I like it. So far, its been worth it. (9 months in and running great!) The lock up is more solid than cheap knives, the knife does not flex when you cut things, the machining and finish was very nice too. The knife is just all around built tougher. The one thing I thought I would hate, the the spyder hole has become one of my favorite opening methods. I thought they looked funny when I bought it and honestly I still kinda do. I wanted performance not looks though and so far, It has delivered.