Several things I question; the unsupported 4th corner, if you want to stamp bigger projects, make a bigger tool.
The hinges, how many times can you pop them in and out before they break or just loosen? If they get a little sloppy the accuracy level drops.
You have to take it all apart to store it. The top lid won't close, and the 4th corner would be subjected to possible warping of the bottom lid.
Myself, I have 3 positioners so I wouldn't consider this one. I also think you could buy 3 Stamp Perfects (if they were still being made) for the price of 1 Stamparatus.