I had a GolfLogix for a couple of years, but I found that I wanted more information that I got with that. I ended up having to use both it and a laser to get the data I need when i play. When I was shopping for a new GPS this spring, I looked at the S1, but it was too basic. I need to know distances to hazards, bunkers, trees, etc., often for either tee shots or for layup shots. I ended up with the Approach G5 and I couldn't be happier. I don't see having it as a separate unit as being a hassle. With the carabiner clip it just hangs on my bag, pops off and on with a quick release, and gives me tons more information than the S1.
I also don't like having to recharge my GPS. A rechargeable is either plugged in at home when I get to the course, or it's in my bag with a dead battery. I carry spare AA Lithium batteries in my bag and I'm always good to go. I get about 6-8 rounds on a pair.
Different strokes I guess.