I love the look of this knife, with one exception, and it is a personal thing. I just don't like having titanium on one side, and G-10 on the other. I just don't like it, and the few I've purchased have quickly been sold. That is the reason that I don't care for the new ZT's, Hinderer models coming out, just can't get behind that construction method.
With that said, the Tuff could be the exception. I will purchase one to see how I like it. I do like how the titanium scale has been done with the surface, and with the steel insert on the lock. My ti Military has the same insert and it has worked wonderfully, locking up on one spot and not moving since I bought it.
Construction like the PPT would certaintly sell me on the Tuff in a heartbeat! But please remember, this is just a personal thing I have with the construction method, and not a jab at Spyderco.