Not sure what the expiry date is as it doesn't mention on the website. But it seems like a good deal for a modular PSU that is 80+ bronze. They are giving away a free 14cm fan which would normally be valued at around $15~$20.
Reasonable review on it: http://www.hardwaresecrets.com/article/Cougar-CMX-V2-700-W-P…
850W version is $129 and 1200W is $179.
Similar promotion to what mwave had ran previously. The product I received was an undocumented V3 revision.
My comment from a previous post:
Just to follow up, I received the PSU. It is neither the V1 or V2 revision, it is an undocumented V3 version. Box and manual mention V3, website has no information on. It appears to have a slightly different power distribution; 12v1 30A and 12v2 26A @ 670W (55A total over 12V rails), compared to V2 which has 30A on both 12v1 and 12v2 @ 648W (54A total over 12V rails). Only other difference is that it has a sticker saying 'Haswell ready'.
Overall I am very happy with my purchase. Much less coil whine caused by/from GPU now. Also much quieter than outgoing Antec PSU.