As software goes, this is reasonable, and it does provide Mac support that Garmin has been promising and failing to deliver.

However. Before investing in TomTom products, you should take into account their very poor service record. Their "support" staff generally know little about the specifics of the products, and you'll pretty much have to rely on the web for real information. Most important, they do not provide updated versions of their maps with any regularity, and when they do, they usually do so only if you buy a whole new system. I found this out the hard way after investing a lot in TT Navigator 5, including maps of all of Western Europe (laboriously downloaded and converted via Virtual PC, since they didn't previously provide Mac versions of the map-extraction software!), only to find out a year later that new maps would only be provided for Navigator 6 -- which won't run on the Palm Tungsten T3 I use Navigator 5 on.

Bottom line: the products are nice (though not uniquely so any more, with increased competition), but the company has a very bad reputation for maintaining and servicing them.