We've had bad experiences with it falling apart every year, even when it's not a component that does anything. We have ALWAYS had to drill through it and run a bolt to get it to stop sliding.
Since it's difficult to drill through 80/20, we WOULD be better of using something else, it would just save us work! Our mentor, though, swears by the stuff because of it's modular nature. It doesn't become so modular once it's bolted into place. He's never around during that part
So my final opinion: Prototyping, maybe. Final build, no way.