Works well. But the wrist strap design is very fragile. It's attached to the watch body using a very small pin and is prone to breaking. I've had my 610 for maybe 4-5 months and it has broken several times, once right at the start of a race. I can rig it back together, but each time it comes apart it gets that much closer to being permanently busted. Many people hated the 405, but I have to say that I preferred that model to the 610, even with the fickle bezel, because it was sturdier. I'm eyeing the that new suunto ambit when this 610 dies or maybe just going to dump gps altogether in favor of something more old school like a simple lap watch.