Not sure if the £9.99 version has the wifi map upload feature. Worth checking. This feature enables you to (on the Iphone 4 anyway) upload all your QCT maps which you got from bit-torrent
The basic MM version does nothing useful; you can just download separately purchased downloadable street etc map coverage, from MM, online.
I tried to check this with MM but they have never replied to a single email I sent them.