I've had the Garmin for around 8 months now and I couldn't be more pleased. In fact on one occasion I arrived at the course, realised I'd forgotten it and seriously considered driving home to pick it up - needless to say the round was fraught!
The Garmin does exactly what you would expect a Golf GPS to do without bells and whistles (some offer a facility to mark the exact location of the pin - but how do you know that unless you walk the course beforehand and some are in colour which must be a drain on your batteries). The Garmin takes easy to find AA batteries and last on my reckoning around three rounds so that would be 12 hours continuous use.
Customer Care at GOlfGPS is magnificent. My course wasn't mapped but a quick web-request had it on the database in a week. Further, the mappers omitted water features on three holes which I considered significant omissions - within 48 hours the database had been amended. It's quite quaint knowing the distance to and over 'the creek'.
I wholeheartedly recommend the GolfLogix.