I'm in the UK and I got a voucher for Christmas for a UK based bike website, so I'll probably get it from there.

Thanks for the advice. Relieved to hear there's the wheel sensor option for uninterfered accuracy with the Edge. I suppose any inaccuracy with the GPS won't, at the end of the day, be an enormous difference and will pretty much be negligible.

So as long as I sit for a moment before setting off and letting it lock on, and then off I go, all will be well? I'll do a bit more reading of reviews and such but as far as I can tell the Edge 500 seems to get almost universal praise, so I'm probably swayed towards that

Thanks folks