I don't care for most sub-100 USD Spyderco models. It doens't matter how useful or reliable they are. Kershaw delivers much better blades at that price point. Above 100 bucks however, Spyderco and Benchmade are kings.
Kershaw makes nice knives, but I haven't found any that have bumped Spyderco out of my pocket. For the price you often get better materials than you'd expect, but I've always found the overall design lacking something for me. Usually ergonomics.