I think it`s a good product as Bitmain is good. I did not have personal experience with C1, but with S1,S2 and S3 miners.
You need good PSU ready.

If you want to buy it I cen give you coupon:
AntMiner C1 Coupon 50 USD but it`s valid till To 2014-12-30 11:10:00 only.
If you want it, send me yout Bitmain ID and I will donate coupon to you.