I was sorely tempted by ZigVersion awhile ago. This is a piece of software that is a well-designed front-end for powerful versioning software, and easy to use and learn. I was turned off by the hefty commercial license, though (since I'm designing commercial websites, with no fronting capital really).
However, this price is very tempting. The only reservation that I still have is that the upcoming Versions from Made By Sofa looks like it might be a competitor worthy of supporting. On the other hand, it isn't out yet and Made By Sofa sometimes charges quite hefty prices, so who knows.
In any case, this is well worth checking out if you use Subversion, or want to use it but are put off by the command line interface.