I personally have worked with Dell for a number of years and never really had any issues with them. Saying that, I've only ever used them in environments where I have large volumes of systems, and never load a single application onto a single server therefore eliminating some of my risk.
As with any blade centre, I do not yet see the total beneficial cost in running them - yes, the management is easier etc.. but the power used by a fully loaded blade chassis is often great than that of the individual servers. Couple this with the fact that in the majority of data centers, you will only get one chassis per rack due to maxing out the power usage they don't really give you a saving in space either - this applies to all blade based servers, not just Dell BTW!
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