Hi,
As I previously said, I own 30Ths from M. Lee since the begining of july. So far no major problem for me.
Even more, each time I get problem, they were dealt and/or I was compensate for the loss.
I choose the professional datacenter and seriously, it works really well. At least for me, but I do not have special treatment, so I assume that it works at all

Here is a picture of my last 24h hashrate (note that one miner is down due to hardware maintenance, thus the 29Ths average).
http://i57.tinypic.com/2iborya.jpgAm I happy with the service ? Definitively !
Antoine