Re: ANTMINER S5: 1155GH(+OverClock Potential), In Stock $0.319/GH & 0.51W/GH
in my opinion s5 it was not a good product, too many problems, so far the best product I've seen were s3 +, those miners were the armed wagon, hopefully in s6 / s7 something powerful and low noise 
In my opinion, it has some issues. Loud fans, and a firmware issue. However, I also think it's been a good product.
Swapping fans was an easy fix. The firmware needed repair, but that is a firmware issue and the hardware has worked well. Overall, I've been pleased with the S5 as a miner. (that doesn't negate some of the other issues we've seen this year surrounding the S5).