That said, there is nothing wrong with the worst. For example, I got the M31 at $22 after shipping, and looking at competing vendors, the cheapest it gets is $27. I was actually aiming for the CC51 (beautiful clarity series), but I was just looking for something to replace the M6, whose memory wire broke, so I'm partially satisfied, even if my hopeless dreams were not fulfilled.
The M31, with no burn-in, is bass heavy with modest mids. The sibilance isn't as bad on the M31 as it was on the M6s, and a few earbud changes make the treble noticeably cleaner (if a bit unemphasized). Depending on the music you listen to, you'll want to adjust the equalizer, otherwise the bass lies just on borderline head-ache inducing versus thumpa-thumpa fun time. If you're coming from the M6, be prepared for the bass.
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1 of 2 people found the following review helpful:
Great
May 30, 2011
Reviewer:
Joshua Hill
from Thornhill, Ontario Canada
For 20 bucks totally worth it. Worst is you get the M31s for cheaper.
I got the CC51P's and the CW31's amazing deal for both!
will definitely order next time it comes around!
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2 of 2 people found the following review helpful:
Jackpot!
May 27, 2011
Reviewer:
michael
from Midwest, US
For $20 it was worth a shot and I got the CC51! Thanks Meelec
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2 of 3 people found the following review helpful:
Great deal!
February 26, 2011
Reviewer:
DervishD
from Madrid, Spain
Even getting just the M16 is OK, but the chances of getting a GREAT model like the M6, M21 or the fantastic M11+ is 50%!
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5 of 6 people found the following review helpful:
amazing deal and products
November 26, 2010
Reviewer:
xfloggingkylex
from Frederick, MD
I bought a set the last time this deal occured, figuring that worst case I get the m9 for less than they normally sell it. Waiting for them to get to my door was so exciting, and when the package arrived I was like a kid on christmas. I got the m9 set, and they sound amazing. Couldn't have been more happy with the purchase, and I will be buying more.
Be prepared for the worst 
Great