I cant try them cuz im from ecuador and Im gonna order a pair from Amazon..
My ranking would be as follows:
Sound Quality - all are pretty close in terms of technical capability but depends on what sound signature you're looking for.
M-100: Bass-emphasized, balanced everything else
Logitech: Relatively balanced/flat
MDR-1R: Mids-emphasized, laid back sub-bass and treble
1. M-100 (by far)
Are the M100 so uncomfortable?