A.W.
This may or may not help -- my dad is a truck driver and SWEARS by his Garman (sp?). Since he's on the road so much with no access to computer/internet (he's kind of computer backwards), he is not able to do updates very frequently. He had a Tom-Tom. And step-father-in-law had a Tom-Tom. Both crapped out just outside the warantee. =(
Hope this helps - A.