Hey - have at it! I had one (for popcorn) and tried it. It made a lot of smoke, roasted uneven, needed constant cranking/shaking, beans got caught under the turner-thingie and it went back to the cabinet. I didn't have good luck with it - which is not to say others won't.
I've also tried wok, cast iron skillet, microwave and all that jazz. On the way in, cheap? Popper. I found one more if you want the old $5/popper plus 1/2lb green beans deal.