Speak for yourself Grandad!
I went for the bolt in the end Andy

. I'm hoping it's not too much of a compromise... maps are obviously better on bigger screens as well as bigger numbers etc but I'm used to the size of the 520 and 500 before that. Where as I think from memory you're more used to a larger unit? At least the buttons are on the face, as opposed to the 520 where theyre awkward to get to. And because you do most of the set up via a phone app it looks much more strainght forward.
Lots of really cool new features to play with too!
Regarding the garmin. Every time I get off my bike since setting up the heart rate monitor it tells me I need like a day+ worth of rest. Yesterday it said 72 hours... I'm assuming this is based on heart rate zones being used?