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 
I consider it a sucess but it seems it depended on your unit. I have had since batch 1 no issues. And have not even updated firmware, just works.
Yes it is hotter and louder then S3. But I have an area for mining so that is ok with me. I would give up quiet and heat to a point to get hashing efficiency.