I used to use Pro Tools Workspace which I believe is what SoundBase used to be a few versions ago. It did the job fine, could narrow down searches pretty well and even edit metadata right in the search which was super handy. It can be a bit slow though, importing a library can take ages and every now and then it seemed to get messed up and need deleating/reimporting. I did find it useful, just a little clunky and prone to mess up.
Im curious to see how the new version holds up though, how have you found it?