I use another brand of liquid chalk.
I've only used it for deadlifts and chinups, so I don't know how it holds up for use with conditioning. Rock climbers seem to use it though, from the Google search I did on it. In addition to what Chad wrote, you don't have to re-chalk with liquid chalk, which is a definite plus. Since you don't have to apply that much per use, it's not all too expensive either. I'd buy at least two at a time if you're purchasing it over the internet though b/c of shipping costs.