I use TomTom for road nav and Memory Map (with Maptech charts) as a backup chart plotter. (BlueTooth GPS means no wires too!)
One thing to note is that the latest TomTom3 GPS software conflicts with Memory Map - you need an older version of the TomTom GPS engine then all is fine.
That's a bit of a pain, though. Using an older version of the GPS engine (v 2.06) means you don't have to do this! I haven't found this to cause any other problems or lose any functionality.