I've finally upgraded from an Edge 250 (Strava sent me it for nothing when they first launched and had no data and gave away 100s) to a 540 and things have changed a bit! Halp.
I did the same, except to the 840*. What do you need to know, might be able to help.
(* I saw a couple of reviews talking about how the button only interface is a bit cumbersome and that the touch screen upgrade was probably worth it.)
@dubtap started
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I've finally upgraded from an Edge 250 (Strava sent me it for nothing when they first launched and had no data and gave away 100s) to a 540 and things have changed a bit! Halp.