I have two Nuvi 765t units, with lifetime European maps.
I can connect to Express with both, have updated the software, have fitted new, 8gb FAT32 formatted SD cards, but the map updates complete but fail to function. I have reinstalled the maps to no avail. Express now reports the units as having up to date maps, but one unit says "no data", and the other crashes and turns off about 10% into loading up the map on start up (and if plugged in, turns on, crashes, turns on, crashes....)
Updates in the past from the Dashboard were slow but at least worked.
I have been trying for 3 days now! I *was* considering buying a Zumo for my motorcycle touring ....