Looks great - has a nice looking interface. Couple little usability things (such as the option for pasting location to multiple images not being where I'd expect it) but nothing really glaring.

Has some more serious issues though. Obviously not multithreaded - only utilizes one processor core. Noticed this when working with a medium sized track log and a relatively small number of images - about 150 (somewhat non-productive one day road-trip shoot). Was quite slow loading/processing the track and matching images to the track. If I was working with a larger data set it would likely be excruciatingly slow.

Also, it crashed (bombed Aperture also) immediately after it popped up a message saying that it couldn't find altitude info and would retry later. Not sure if that's why it crashed, but it was immediately after that. This crash happened within the first 15 minutes of working with the plug-in - doesn't bode well for the future.

I'd really like to love this plug-in. I'd be great to integrate my geotagging into Aperture. Would probably even pay the $40 (although the price seems high). That's a premium price for what this plug-in does so it'd have to at a premium level of polish, performance, and stability which it doesn't appear to be. For now I think I'll stick with the free geotagging tools available before importing to Aperture.