From: jasee on
The trouble with G.A.G (IMO) (as recommended here) is that basically the
boot loaders and the configuration has to be right, already, or GAG doesn't
find anything to load, however Super Grub will actually install itself and
change its configuration so that it points to the right partitions.

Maybe GAG will be more useful if multiple instances of (say) Linux need to
be loaded (if it can find the right partitions).