I built one after using my friends peps X stand: http://www.pepsx.com
I love it and always use it to get the jack out of the way.
Much more stable. Once when my Strat was on the Jack I was wrestling a front tire on and almost pushed the bike off the jack.
Also protects my jack when washing the bike. Ruined the cylinder rusted and pitted on my last jack.
Stability is the main
reason. Bike is solid as a rock on it. See pics on my Dropbox showing my Strat on it, in the mods/freedom duals folder and the steering head folder. https://www.dropbox.com/sh/fd9w68l93ngp8hd/GW6rxSmfza