None that I am aware of.

Must use Delorme mapping software to transfer data
Proprietary data format (must export from Delorme software to GPX)
Lousy battery life
Bulky
handlebar mount sux balls

Buy a Garmin. Do not get suckered into buying one of these pieces of junk. I was lured in because of the good deal on downloadable basemaps from DeLorme, and because it looked like the handlebar mount was good. The basemaps proved to be worthless, I could not see any detail either because the maps or the display were not up to the task. And after I'd had it a very short time I learned to loath the software that I had to use to communicate between my computer and the receiver. And I was terribly disappointed in the handlebar mount (which was also an expensive add-on). The battery life sucks, less than 7 hours in my experience.

Similar Products Used:

Garmin eTrex Legend, and eTrex Legend Hcx
Garmin Edge 205