steelerguywrote a review of Garmin Edge 810 Bike Computer on July 19, 2013
Familiarity: I've put it through the wringer
I have used the Garmin Edge 800 for a little over 2 years. It developed a problem and being that it was out of warranty, I had to send back to get a refurbished unit for $100. I decided to upgrade to the Edge 810 while I waited for my refurb unit.
Easy to set up bike profiles (TT bike, road bike, MTB with different sensors on each)
Easy to set up activity profiles (training, race, even have a kayak profile)
Easy to set up custom screens displaying the data you want
Gets GPS lock even faster than the already fast Edge 800
Bluetooth connectivity to phone is the biggest upgrade. I can upload workouts immediately without connecting to computer. You can also stream your ride using the Garmin Connect app on your phone. A great way to let someone know where you are, especially in case of an accident.
The ability to create a course on the Garmin Connect site and then transfer it to the phone without hooking up to computer is also an excellent feature.
Battery life isn't what the Edge 800 was, although I have certainly had it last a lot longer than 5 hours mentioned in a previous review. I have used it up to 10 hours and it hadn't died but was in the low teens on charge percentage.
There are intermittent connection losses with my Ant+ power meters. All will be fine and then suddenly my power and cadence drops to 0 for 5 seconds or so. Then power shoots up really high (although my output has not changed) and it all starts working again. I think it pretty much averages itself out so it doesn't matter much unless you are doing short intervals. The Edge 800 did not have this issue.
Overall, I think this was a solid upgrade. I would not have done it if I hadn't had problems with my Edge 800. After 2.5 years of use in all conditions, I was willing to overlook the $100 to get a refurbished unit. If making a decision between the 800 and 810 I would chose the 810 based on bluetooth alone.