I tried the Xplained.
Wow, very well done!
I can't complain about the content or quality of the Anderton vids but no index, just long movies that you jump around to the part you want.
(the timeline tells you the name of the chapter which helps)
But the groove 3 have such a nice video interface, works like a charm, and easy to understand.
A very big help.
I'll pick up the other two here pretty soon and save my $0.10!