I tried the demo for Basehead on Mac - it's relatively inexpensive compared to Soundminer v4 (Pro), but I personally did not really like it. Have now started using Soundminer HD+. It's very good, and fast in both searching and adding metadata. However there's one big issue with it that I failed to notice before purchasing: it only transcodes up to 48kHz. You can still export higher res audio files by simply dragging and dropping, but the transcoding is used for a lot of its more funky project file sorting/organisation functions. In other words, that functionality becomes moot as soon as you're working with files of higher resolution than 48K. For this, you'll need to spend $200 more and get v4 (which I've never used).
All in all I would still recommend Soundminer HD+, certainly when compared to Basehead which is in its price class, for its ease of use and file search/library management.