As far as M4/M4-1's are concerned...
I love the short key travel and feel of the buckling rubber sleeve. No mush whatsoever. Feels a lot like the older thinkpad keyboards (except stiffer).
All of the M4's I have received NIB have the straight cables. (all of the M4-1's have the coiled y-cables)
I typically pick them up for around $35 NIB (Unicomp really needs to adjust their pricing)...so they are my favorite economy 'board that I can deploy around the house, leave at various work locations, etc.
The more of you that DON'T like these, the better for me. I plan to continue to horde them.