I believe the Smooth Hound, Bullhead, and other similar 1st or even 2nd gen lock jaw bikes are no longer available. I looked into getting one for quite a while, and had to really scour the web to even find used ones. I think the Dash D18 is the latest version of this bike format.

I came across some of the same concerns (integrity of the lock jaw over extended use) in other forums. My impression is that the bike is first a minivelo that if you have to fold, then you can do so. But if you're folding it in and out day after day, you'd be better off with a folder that's designed expressly for folding.