Well my 550 is dead. This unit is 2 years old. This is my 2nd or 3rd go round with garmin, sending me refurb units that eventually crap out after a few months.
They offered me an out of warranty repair for $150, that has a 90 day warranty. At that price I'll buy a 220.
I rode through a massive rainstorm the other day -- the last day that the unit was working.
I wish there were more GPS options. A buddy of mine rides with a droid phone for a gps.
I'm a little pissed because I bought this thing new, retail, and I have had nothing but problems with it.