I remember my first contract in London some 13 years ago - first week's (ease in) simple task was to upgrade the firmware on 10+ servers - the first one crashed on the upgrade and was unrecoverable.
Still can't find a link.. if anyone can send me one I'd appreciate it..
Still can't get Post Codes to appear on the menu.. so need to downgrade and upgrade to v32 again as I don't think I've go the correct firmware installed.
I think there are various flavours. Colours is one thing, some have a night colour scheme and full postcode search via the main nav menu rather than the info menus. (Obviously this then requires a hacked nav disc too). Some also have poi alerting, set up for speed cameras (also requiring a hacked disc)
The only issues I've heard of are occasional dropping into French language, and occasional lockups.