I got the FR15, and I've had it for almost 4 years now. I only use it while running, which is every single day of the year.
I average 2,000+ miles per year... so that watch has gone a LONG ways for what I paid for it.
I have nothing bad to say about it's accuracy, and in fact, it really does beat the more expensive versions of the FR.
Only complaint is when you stop the watch, it wants to go to power save after 2 minutes and the fact it only has a timer function and NOT a stopwatch...
Once the battery starts giving me trouble, I'm likely going to replace the battery and keep the watch and keep on using it...
Some of my friends are surprised I don't have a more advanced FR... I asked them: Are you gonna pay for it?
When I'm not wearing my Garmin, I'm wearing my Seiko 5 Automatic tunacan... no batteries necessary. lol