This is worrying. I had planned to change from my StreetPilot 111 DL which has given me no trouble at all to a Zumo550. Might have to re-consider, and just endure the piss taking from my riding mates about my antique, steam driven piece of kit.
Strangely, coming back from Magny Cours I met with Dellis and his good lady, and when he saw it he said to keep hold of it at any cost. Maybe he knew!