I had a double one from VO a while back. It worked great as a kickstand - you could lower the feet so that the bike was basically on both wheels and the kickstand at once - very stable.

However, I ditched it because I didn't like engaging it. The way you have to kind of lift/rock back the bike to engage it was annoying, and it always felt like I had to shove it with my foot too much to get it to close back up since there was so much weight on it.

I now have a single kickstand mounted on the rear triangle, which I love - very stable as well, easier to engage, plus: you can roll the bike forward or backward with the kickstand down. SUPER handy for moving it around in the basement.