But as far as the Microtek backend goes: it's pretty basic right now.
All E6 scan modes are implemented, but many image enhancement controls
are not (i.e. gamma tables, digital brightness). Exposure/contrast act
a little funny, too.
The command line 'mtekscan' is pretty feature-full, but also suffers from
some of these funny controls, too.
For $30, I'd try to figure out which hardware is more solid....