Sorry, goofing off, I guess.
Selmeston, I used a 2720 on my motorcycle (a Honda PanEuropean) for about 25,000 miles of riding this summer, and it worked perfectly. The newest generation of Garmin GPSRs - the 27xx series and 72xx series - use solid state memory for the maps, this means you could even put them on a Harley-Davidson and they would survive the vibrations.
However (I sure hope Garmin doesn't see me writing this, they'll kill me for it), if you don't need the speed camera detection and/or the traffic message channel support, get a 2610, buy a huge CF card for it, and you will have pretty much the same functionality for about half the price. The 2720 has a newer, somewhat easier to use user interface than the 2610, but the truth is that GPSRs have come so far in the past five years that it is getting really tough for the manufacturers to come up with earth-shaking advances from one product release to another. Think of it this way: Would it matter much to you if you were forced to choose between a 2005 Bentley or a 2006 Bentley? I mean, really, either one will do the job perfectly.
Michael