I use a Sirf III GPS puck with the TomTom software with my Nokia E61. Just spent 4 weeks in the UK and it worked brilliantly. However - I had 2 instances of the TT software shutting down after around 2 hours. Methinks it may have been Goodlink synching at the same time - asking the processor to handle an intensive app like TomTom and synch email at the same time may have pushed it over the edge.
However, being a Nokia, it shut down nicely (the app - not the device
) and when it restarted it did so still "live" - ie still on the same destination...
A quick note - the TT software assumes you have the TT puck - so you have to search deep in preferences to change the GPS device.