Every laptop I've ever had died from hinge-strain breaking the hinges.
This just seems like the worst of bad ideas possible. And it hinges on the side? God, that's going to put tremendous strain on parts of the screen that were never designed to hold weight.
Even if it's not just a con, there's no way that's a practical product unless the original laptop is designed for that extra weight and strain.
Yup, I am with you on this one. I am a lot more interested in this option, but I haven't got the cash (or desk space at home) to try it right now.