I have scheduled mine VCAP5 DCD in this month as well , I have already cleared the VCAP4 DCD. You can find my exam experience here.
http://thinkingloudoncloud.com/2012/07/my-vcap-dcd-experience-2/
I am also sticking to the Blue print all the documents described in the blue print is good enough. Important part is to practice mock designs in networking , storage. This is helpful for the scenario based questions. Also leave the scenario based question in last. All the best.
I have a good networking backround in Cisco, and I am pretty comfortable with what is in the blueprint. Im not as good with the storage, but it isn't that hard from what I have been finding out. It is mostly math.
When I have taken my CCNP test it has about 70 or 80 questions in it, and I have a very bad habbit in not being slow to test. They give you alittle over 2 hours and I did the whole test in 40 minutes. With that said, it isn't that hard if you know your stuff and that is what I am trying to do, not just pass the DCD exam, but to learn what is the best way to do things and how would you go about doing that.
Thanks for your input!
Hutner
There's some useful info and links on my blog: http://vmwaretraining.blogspot.co.uk/2012/03/vcap5-dcd-information-and-preparation.html