Well, I've been using OT PPP lately, and I've been really happy with it. The only thing I miss is that I can't seem to find a way to script it, or use a macro program to automate connects/disconnects without going through the PPP control panel.
It seems to me like I get slightly better speed with OT/PPP, plus the connects and disconnects are non-modal, so I can do other things while waiting for it to connect.
Currently, my machine is running _very_ stable, although that's partly due to some system software not in general use yet. (shhh.... :)