Yeah, that's sweet... or would be if I had a stereo bluetooth headset that fit in my helmet. Details.
My 2610 is one of those "good enough" products though... until it dies or is stolen I probably won't buy another land-vehicle GPS because the 2610 does 95% of what I'd like it to do. I've updated the maps once, but in all honesty I could've skipped that and it would still do very well for what I want.
It is nice when I'm near home... I can always find an alternate route or explore without the total aimlessness of just driving around. It is hugely amusing to tell it to find the "shortest" route to someplace 100 miles away... it'll lead you through all sorts of back routes, surface streets, residential areas, and so on... and sure enough it saved you 2.3 miles on that hundred mile trip. It is even better when I fly off to strange cities... it has a soft base you can toss on the dash of a rental car and it does a pretty good job of taking you where you need to go... including finding restaurants, banks, and other useful destinations.
The biggest disappointment is actually something that 2820 doesn't fix: it has no internal battery. It is totally oriented towards vehicles with cigarette lighter plugs available... which kinda sucks. Of course it is huge and you wouldn't want to carry it around... but it would be nice on a bicycle too. Oh well.
The bluetooth MP3 player thing would be a complete sell if it had a radio interface (FRS or the like) for bike-to-bike. That and a stereo bluetooth headset, all for ~$1000, would probably get my money.