I had a battery issue with my Edge 820 that otherwise was performing well, so £90 later I sent it back to Garmin and received a refurbished 820, as per their policy. Well the thing took forever to connect to my phone, took forever to connect to my sensors, used 42% battery on a 2hr 20min ride with only GPS on (no Glonass) wifi off and bluetooth on. Not only that, but the actual GPS data recording is horrendous vs what my old 820 used to do.... I rode east along the grey road, then south down the orange road FTR. I realise the next step is to contact Garmin again, but I'm afraid the next one they send me might not even switch on. Anyone had any experience with refurbished products from Garmin?