While I'm currently a smartphone Golf Logix user (free version), I've been considering a watch gps unit. From what I've researched, people really like the Garmin watches; I like what I've read as well. There's been some recent complaints about the S3 having to be rebooted from time to time...the assumption is that Garmin tried to pack a bit too much technology into a small platform and it's caused some problems with that model (touch screen, text messages, etc.). People seem to worship the S1, but the lack of score keeping capability and dog-leg/hazard info causes some to lean towards the S2...which is also a solid watch, according to customer reviews. For someone like me, that doesn't really need to know the distance to the green on par 4/5 tee shots, the S1 should work.
I've also had my eye on the Golf Buddy GB-WT3. I like that watch because it gives a reading to FCB, as well as an actual outline of the green from the location in which you are standing on the course. While the S2 and above gives you an outline of the green as well, the GB has it all on the same screen...if I'm not mistaken at least one button has to be pushed on the Garmins to get that view. Not really a big deal. The GB is a little more expensive than the S1, but less than the S2.
If anyone has any additional info on the GB-WT3, I'd appreciate hearing your take.
I hope this helps.