A great unit if you are only wanting to use it on a motorcycle. If you want to swap between car and bike there are a few niggles - mainly the fact that it does not support any speakers, so when used in a car you still have to wear the bluetooth earpiece in order to hear the voice navigation. It's a shame really as the advertising is a little misleading on this subject, particularly as many motorcyclists are also car drivers.
In use on the bike the unit senses when you are in moving and then prevents use of many of the features, supposedly for 'safety' - you cannot, for example, replan a route or make an outgoing phone call. There is a way around this that involves some sticky tape - this can be found amongst the tomtom forums, but it dissapointing to have to resort to this.
Overall, the functionality of the unit is fantastic, it is the practicalities of its use that let it down slightly.