I also think the Milgauss is a very interesting rolex, looks different from the common Sub, SD, GMT's, etc. Some people complained about the lack of date and incorrect font on the dial. Seems like minor issues. the gen looks and feels very nice (unfortunately, I don't own one, just tried at AD). About the GMT IIc , nothing to add, tons of words were writtrn in RWG and other boards.
If you can afford it, get them both..