I've been using once since 2008 November, and have been quite happy with mine. A bit large, perhaps, and an odd number of batteries, but it's got a good chipset inside and does exactly what I need without extra bells and whistles to get in the way. I've been recommending it when customers of my Mac geotagging software ask, and even wrote an unofficial guide in hopefully a little better English with some tips I've discovered (http://calftrail.com/support/amod_agl3080_guide.html
). Unlike some of the loggers still on the market, this one doesn't need drivers and just shows up like a "thumb" flash drive.
I did have one acquaintance try it and return his, only because the strap interfered with the USB cable and it bothered him. I've not had that problem, so that was a little surprising, but just could be an issue.
hope this helps,
-nathan vander wilt