It took me a while to "push the button" on buying this watch. It wasn't the money. The price is a bit salty and other units out there are reported to perform well. But I wasn't keen on running with a cell-phone-sized monster strapped to my wrist so that I could save a few bucks. No, my hesitation was because some of the online reviews I'd read were critical of the watches functioning - particularly the bezel interface.
I'm here to tell you - Don't Worry! I've had an opportunity to put this thing through its paces on both ends of the climate spectrum, and it performed flawlessly.
In one week, thanks to a trip to South America, I was able to use the watch in 90 degree weather and 20 degree weather. The watch performed well with sweat, with gloves, with cold fingers and hot - no issues.
You do have to know what you're doing, so as we in high-tech jobs say - "RTFM." (Read the freakin' manual!). I recommend establishing your nine key metrics (three each on three screens), set the watch to auto-scroll and lock the bezel after hitting the start button. You're never more than a second or two from what you want to know, and if there's something you're particularly interested in, set it as a data point on more than one screen.
This watch can't be beat, and if you're even remotely serious about running, it's worth every penny.
Garmin Forerunner 405CX GPS Sport Watch with Heart Rate Monitor (Blue)