I am also curious about this. Before finding out that the Garmin USB 18 is only compatible with the Garmin Software i ordered it. My thought was that if the nroute software isn't good, then i can just use something else. I guessed wrong, now I am wondering if i should not even open the USB18 and return it or give it a try if it's good.
It should be here in a couple days, so i'm just wondering what to do. I think i'd like to go with something that has more software compatibility