I have used my MC-2G for about a year and am very impressed, I can not think of any improvements that I would make.  To adjust the magnetic declination, the compass is flipped upside down for access to the adjustment screw and for direct reading of the declination scale.  The fine green index line was a little difficult to see until I started the adjustment and the line moved away from the red declination marks.  Now that I know what it looks like - it is easy to spot.  Two of the scales read directly in miles, one scale for maps using 1:24000 (1 inch=24000 map inches) and one scale for maps using 1:62500 (1 inch=62500 map inches).  I believe the scales do not go to the corners of the compass because the corners are rounded, plus the three scales would then overlap.  This is my favorite compass.