I have a SOG Flash 2 and several spyderco's, I got a Tenacious for my dad and had a week to get a feel for it, sharpened it up, opened and closed, etc. While the AO on the SOG is fun to play with sometimes (the only AO I have) and the ARC Lok is easy to manipulate, I definitely prefer the Tenacious, G10 is grippier, and just feels more quality than the zytel/plasticy feel of the SOG, the SOG also has blade play both vertical and horizontal that I just tried to adjust out, I got the horizontal blade play out, but can't get the vertical blade play out and still open the knife. I don't like the combo edge of the SOG, the steels are about the same ease of sharpening and edge holding from my experience. I also like the jimping on the tenacious, while the Flash doesn't have jimping at all. One other knife you might look at in the same price range is the OD-1 from kershaw it has better steel IMO, is a frame lock/g10 handle, I got mine on clearance for $20.