I saw that they make trainer models for the Delica and Endura as well as some other spyderco knives. I can see whay you would make them for balisongs, but why for spyderco knives? I have 2 Spyderco knives and love them and dont see how you wold need a trainer to practice with them...They arent made to be wrist flicked or gravity opened and they arent made to be swung closed like an axis lock....And i dont think these knives are used for knife fighting...so why the trainers?