The most valuable features are its stability, reliability, ease of management, and high performance. In fact, the reason we buy HP products is because of their stability. The are very, very dependable in that regard.
The ease of management allows us to see issues related to server problems and the functioning of VMware products on those servers.
Scaling comes at a high cost, and it can be complex to set up. I'd also like to see how HP Synergy can improve the performance of BladeSystem.
We switched from the DLs to the BLs about 10 years ago.
Deploying it is not a problem.
It's highly stable and we have no issues.
It's scalable, but expensive because you have to buy additional blades.
The setup is easy or complex depending on what you want to do.
It's the best product for the time being so there's no reason not to buy it.