Although my experience with laminators is limited, I'll offer this piece of advice up. If you do decide to get the DingTec (EnduraLam) from Signwarehouse, watch all of the videos for setting the thing up on their site. If you adjust the upper and lower pressure rollers like they tell you, all goes well.
I had never sent anything larger than a letter size sheet of paper thru a laminator before I got mine, and now I regularly send 8, 10, and 12 foot by 52" wide prints thru it. Believe me, I'm very lucky, but I do believe that if you set it up correctly, it works very well.
On a side note to this, SignWarehouse recently changed the model of the dingtec that they are selling. I blew a fuse in mine when I first set it up, and came on 101 to find the location of the fuse, and in talking with Valentino, we figured out that mine was a newer, heavier version. Almost double the weight, in fact. It's made out of kind of uni-body construction with heave 10 gauge plate steel. The top cannot be taken from the bottom. It's one heavy bastard, but it works well.