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From Fellrnr.com, Running tips
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→Cons
* Some people find the 310XT to be rather large, and it is much larger than a normal watch.
* The battery life is good for about 16-20 hours, which is enough for most people. Ultrarunners doing 100 mile or longer races will find this a problem.
** For 24 hour races where the GPS track is not important, you can extend the battery life by turning off the GPS receiver and use the footpod. After 12 hours of running I still had 85% of the battery left. * The heart rate monitoring is not as reliable as the Polar systems, though I'm told a new strap is coming that improves this. I find that the Garmin heart rate strap give bad readings far too often, even with a conductive gel. There's nothing more annoying than seeing your heart rate way too high when you're running and having to joggle the strap to get it working again.
=Cheaper - Garmin 305/205=
These watches are the predecessors to the 310XT and are quite similar in a number of ways. The 305 has a few extra features, such as the heart rate monitor and support for a footpod. See DC Rainmaker's [http://www.dcrainmaker.com/2007/11/review-of-garmin-forerunner-305.html full review] for more details.
