The idea of this software is to connect your nuvi to internet.
Besides Live Weather, 3d Live Traffic, Real-time safety cameras, photoLive traffic cameras, fuel prices, Garmin tracker, Google search, the idea of exchanging points, favorites, recent finds and last parking place between your phone and your Nuvi, yes maybe, is .....not useful at all.
The idea of having Google Maps and Navigation to work with your Nuvi is also ....not useful.
At the end is up to every user to decide how useful it is.
(Don't forget that some of the above features are specific country, Law dependable, so for example don't blame Garmin if German laws dosen't allow the use of Garmin Tracker in Germany).