I have to say that Spyderco's are some of my favourite knives. I love the hole because the method of opening them really suits my hands. I have very large hands and I find using thumb studs on knives is uncomfortable. I had a Rat 2 and sold it because it was too hard to open, great knife but. But with Spyderco's I find even the Manbug/Ladybug I can open with ease. The only knife I still have with thumb studs is a ZT0550.