Can anyone tell me more about dr.server

I have been hearing a lot of things about dr server and how good they are. However, I am slightly confused, seeing as they seem to have loads of different websites offering different services: drserver.net https://dirtcheap.ninja http://xenstorage.com http://byteshack.net http://abusivecores.com

What are the other hosters that a powered by drserver or is that all of them?

Also what do all of these services offer, what is different with all of them and which is best for what?

Thanks.

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