I've been using a garmin watch to get yardages and track my shots and I honestly feel lost when I can't use it (ie. battery dies, or course has changed so the yardages are all way off).
The first version only gave me distances which was all I was after. Now it can track shots which is a huge add. It basically records the gps location of each shot. It automatically distinguishes between practice swings, and actual contact.
By doing this, it's trivial to measure a shot (walk up to your ball, and it shows you the distance from where you hit it). It then allows me to review my round afterwards by being able to see all of my shots overlayed on a picture of each hole.
It's not perfect - maybe about 90% accurate, with some missed shots. And it gets confused if you have to rehit a shot because of OB (I generally will just take a lateral drop in these instances unless I'm in a tournament with rules) but good enough for me as it is all automatic - basically no fiddling with the watch at all during the round.
Garmin also used to have a swing analyzer you attached to your club shaft, but I never got to try it out, and it has since been discontinued. More a driving range tool than something you use during a round.
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