Memory Map send you the charts on a CD which you load onto the SD card. The MM software is pre-loaded on the 7000 adventurer, or you can download it from the MM site & load it on to a lower cost Road Angel 7000. Look in the MM support forums for the Road Angel 7000.
I worked directly with the SD card. The first one I buggered about for an hour or so, but I was playing with the MM software as well. The other 2 or 3 (I loaded up the maps & software for the other guys at my strip) took about 10 minutes each.
Note that if you plug the actual road angel into your computer with a USB lead MM sees it as a "Mobile Device" rather than a "GPS" (differrent menu to find it).
If you buy one and have a snag with it then PM me.
Dave