I think your question is a bit vague. There are many organizations that use all HP branded solutions and deploy things on them. This is no different than CloudSystem. Really the only difference is that it all comes prebuilt in a rack so the deployment time is smaller.
No different than Flexpod or vBlock.
Alternatively most vendors also have proven specs (like EMC vSpex) where you can buy your own components and still get a guaranteed outcome.