This is just a warning to anyone considering buying the new Garmin 610 Forerunner. I picked one up at the Boston Marathon expo. Though I thought it worked fine for Boston, when I got home and started to use it for everyday training, I noticed problems with the GPS. Everything else about the watch works great. The GPS, not so much.
It loses accuracy in most cases when you hit start and use auto-lap. It is intermittent, but it does happen.
I documented my review and comparison to the 305 which I had used for 3 years.
See:
http://garmin610problems.blogspot.com
If they fix the GPS problem it is a great watch. Until then hold off, or cancel your orders.
And I am not a troll... And don't give me the GPS speech about accuracy.