I love the full-length covers on the Golden Melody, which make
puckering up and down the full length of the harp more comfortable,
in my opinion. There's less to snag the facial hair. Roudned
bosies are easier on the hands. I also prefer Hohner handmades,
since their easier to make overblow-friendly.
I can't imagine that a bend on a GM is any easier or harder than on
a Special 20, aside from just the random way the factory has
adjusted the action. Another sampling of two randomly chosen harps
might swing things the other way, or have both be exceptional -- or
unacceptable. At least with the Golden Melody, like the Lee Oskar
and the Special 20, you can remove the covers and easily access the
reeds for adjustment.