Pros: quick, convenient, accurate
Cons: eats the battery
The GPS software works smoothly on my Curve 8900. It follows me from hole to hole, lets me know when I'm about to hit a sand trap, and tells me how far I can dream about being able to shoot to hit the green. I've had a few problems running it, but when I call them up, they answer right away (in English. No thick accents!) and have fixed the issue every time. (Phone settings. I need to stop letting my son play with my phone. ) That kind of service is worth the money.
Minuses, it can be hard to see in full sunlight, but that's the nature of the beast on a phone screen. And a full charge of my battery is basically a round of golf, but I have a charger in my car now, so all is well.
Looking forward to hearing how people like it on the android phones, since I'm thinking about switching.