This morning I took the VCP510 exam and passed!
This was a little tougher than the VCP4 exam. 85 questions, and it took me an hour. Lots of good questions. This is one thing that I have liked about VMware, is that they make it near impossible to pass these without hands-on experience (either production, or a lab).
Good luck if you are going to take it soon – remember, you have until the end of February to pass otherwise you will have to take the “What’s New” course.