Joe,
I've got the M-Classics (bought new) and I love it. Going out with it today, in fact. Yeah, no padding can be a problem, but there are three semi-compartments in the main body (two flappy things gives you three places to put stuff) so stuff stays more-or-less segregated. The design hugs my body more than any other I've tried, and it broke in nicely (nice and soft) and it is dirty, which is important to me.
I love the way I can secure the flap over the top with the velcro (lots of velcro) or I can strap it shut with the three big straps, or I can leave it all hanging open - nothing will fall out, but I still have very easy access.
It works equally well hung over one shoulder or over my neck-and-shoulder, and the wide canvas strap with leather pad is comfy as well as non-slippy.
The waxed canvas is waterproof as well as attracting dirt like crazy.
Gotta go now - doing a sunrise for the first time in a gazillion years. Taking the M-Systems bag, two Canon FD-mount SLR bodies, 28mm, 50mm, 90mm, flash, cleaning supplies, 2x extender, cable shutter release, 10 rolls of film and a cell phone inside the bag. Carrying a tripod and 200mm lens. The 28 and 90 are Vivitar Series One, so they're big, otherwise I could get the 200 in there too. Oh yeah, and a rangefinder of some sort. I guess an old Paxette. Way more than I'll need.
Later,
Bill Mattocks