There is lots of discussion
here.
Posts are in several of the sections. Worth checking up on the difficulty of installing Tom Tom 5 on it, but there are posts with detailed instructions.
An alternative package with Mio Euro maps at a good price.
I would be interested to know how long it takes to boot one of these up and get your first results compared to a TT one.
Also, you would think they would do some sort of car kit cradle with a power connector similar to a desktop cradle, but I can't find any info on cradles at all.