Even if you can get the maps for free, its annoying that the Garmin doesn't come set up with them by default and let a user change them if they prefer. If I got one and then had to do extra steps to set it up, it would mean it would sit in the box longer for me to do so.
Also disappointing to hear that the Garmin 510/810 do not have Bluetooth LE.
The more I hear about the Magellen Cyclo the more interesting it sounds. Don't have the $ either of them right now, but when I do the Cyclo 515 might be the winner (bluetooth smart sensor support is a huge bonus for me as well).