I have used TomTom Navigator 3 on an HP ipaq Pocket PC for about a year without problems - including the installation of upgrades etc. It's very stable and directions are usually great. I had a minor issue at original install but got it sorted really quick by phoning the helpdesk - it was my firewall that caused a problem.
I've just taken advantage of a great deal to upgrade to ver 5 that includes maps for the whole of Europe. That was causing real hassle - got the software on but the maps wouldn't load. It said "Not enought space on Temporary folder - unable to run SETUP".
Solution? Copy the whole of Map CD1 (UK) to a folder on PC and run from there - it was trying to create a temp folder on a CD!
Rider DOES look good eh?
Garry