While my experience with laminators is minimal, I did buy a GFP from Drew @ Airmark. I know Phil posts on here quite a bit. I heard the learning curve on laminators was steep, however, this thing is rock solid.
Things I noticed.
1. I thought I wanted heat assist- Drew talked me out of it- he was right. I don't see the need.
2. The GFP, while more expensive is chain driven vs spring, so the rollers maintain constant pressure on both sides, plus the rollers are crowned, leading to a better finished product.
I can't tell you how much of a difference it makes, but I am sure happy with mine.