Summary: Selling firm and shipping was great - very quick, well packed. Now the unit: It's still buggy (even with firmware 2.7). I've had this unit shutdown on its own for no reason mid ride (battery was almost 100%), twice since I've owned it (and that's two weeks). Contacting Garmin support gets you the modern-day script following troubleshooting, none of which actually addresses the issue. Garmin forums also contain many other users with similar problems.
Summary: If Garmin's target audience is the cyclist who rides a few dozen miles per summer and thinks that spending big money on flashy parts makes them a better rider, then this product is perfect. If Garmin thinks this device will suit the needs of a serious cyclist, they have a lot of redesign to do. Starting with the positives first, the 810 does do some things well.
Summary: I have had many Garmin GPS units for car, boat and bicycle. Generally, I am a Garmin fan. Hands down, though, this is the worst of the lot. From the outset the unit has had problems serious enough to make me nostalgic for my Garmin 800. When using a map card, the unit would freeze up and shut down. Only way to use it again was a forced reset. The unit would then take 5 - 10 minutes to reacquire satellites before it would work again.
Summary: Several times now I've had a ride interrupted when the unit has crashed when switching between displays (wanting to look at map to see which way I'm going to take next). This is incredibly frustrating, when I'm out for a 4 hour ride I don't want to have to interrupt it to reboot the GPS.
Summary: I am a long term cyclist and Garmin navigation and fitness device user, ranging from the eTrex series through to Edge series including the 800 and now 810. In general, I think that Garmin produce excellent navigation devices which have guided me, my wife and members of my club over many thousands of cycling miles in the UK and Europe.