I'll also chime in with an update on ours. We bought the 65" (Pro S) one from Dave in September last year. Still have not used the heat assist, not one single time. Not to say we never will but just have not had a need to. Very happy with our purchase although I have modified the machine slightly and have also needed to adjust things once. We have run a lot of material through this thing and yes the motorized roller lift is nice. As far as tracking goes its better than the old GBC Arctic Titan we have ever was. Is it perfection, no. Does tracking greatly depend on the operator making absolutely sure both the laminate and material to be laminated are perfectly straight and lined up with each other, yes of course but I'm not sure there are many laminators out there that will make sure of this for you. It also helps if the machine is adjusted just right. We have runs many dozens of full 50 yard 54" and 60" rolls through it using the takeup reel and getting the entire 50 yard roll through in one single run. I'd say the most I have seen it track off is under a half an inch, usually 1/8" to 1/4" is more like it. I attribute the 1/2" off due to our loading the material less than perfect and of course a half inch off on a full roll that is rolled up onto a core is a bit annoying since that edge is all sticking together.
I'd say for the money this machine is a no brainer though and cannot be beat. The value is tremendous. Again, is it perfect? Absolutely not, however for what it cost me, am I happy with my purchase, extremely so. If I wanted the best out there I'd have spent 15K plus and bought an AGL.... One day I probably will but until I can justify the cost we are happy as can be with what we have.
Dave at US Tech actually also did contact me about my modification to the chain and said they are probably going to eventually have the factory engineer future machines to have the same modification. What I did was reroute the drive chain to make the front takeup roll in the opposite direction so that it is rolling the material face out. Thread I had made on ours is here --->
http://www.signs101.com/forums/showthread.php?119656