This was being was on promo today at MacUpdate Promo. I only downloaded the trial, but felt that I saw enough to make the following comments on the MU Promo "discussion: page.
Looks interesting and the concept is sound, but the following items are issues for me.
The zoom control only seems to work by clicking on either side of the slider. You cannot "grab" and drag the slider. Annoying. I"m using OSX 10.6.8, if that matters.
Second limitation, and most important to me, is that the only view of the items in your collections is a space-wasting icon view. Also, in order to be able to fully read even short file names for the icons, they have to be zoomed quite large. Zooming to a large size is even more of a requirement if you expect to read secondary (subtitle) information, such as a date/time stamp. I really wish this program had a "list" view, similar to Finder.
I'm passing on this one for now, but perhaps future updates will address the issues of concern to me. I'll keep an eye on it.