Bitfury is peoviding them. They have already gave 1 PH. See https://bitcointalksearch.org/topic/the-official-information-resource-for-bitfury-group-896350. ROI looks almost same.
I think i read somewhere that BitFury has their DC in Georgia.
From what I can see, Bit-x is more expensive per GHS and their maintenance fee is slightly higher than HashNest's.
There's interesting times ahead because whichever companies come up with the sub .01 w/ghs chip will likely be able to set lower prices and maintenance fees thus gaining a larger portion of the cloud mining market. From what I've read, Bitfury is fairly well placed in that "arms race".
So, with BitFury supplying hashing power, Bit-X looks like it will be a contender for some time into the future. Who knows for sure? Look at what happened with AMHash and I'm sure many thought they would be a long time contender. One thing we do know is that BitFury has been around for as long or longer than its competitors.