I've been looking for one also & the summit / woodward fab / HF tools / Northern tool ones all seem pretty much the same.
From what I've read, they work, but not the greatest. The frame is somewhat weak & can flex which isn't a good thing.
Some pictures of owner modified units show a bigger frame built around the unit & welded to it to make it more rigid.
For a floor-pan that will be hidden by carpet, it will probably do the job.
If you were doing door panels, etc where you are looking for nice crisp lines that will be seen, a better machine would be a good idea.
I would like the one that Baileigh industrial sells.... but it's a little more $$ than i'd like to spend.