Yes,I have already taken the required class my work paid for. Not only do I run a large vSphere enrivonment at my work with over 600 VM's and a large View infrastructure, I also have my home lab which consists of 2X ESXi hosts and a dedicated FreeNAS iSCSI datastore.
I am just nervous about sitting this test since I have never failed an exam before and I keep reading a lot of failure reports for this one. There is a lot of stuff for this test that even somebody like me that runs a large vSphere environment with a lot of experience has to study hard for like the maximums and different vSphere editions. All of the labs in the Sybex book I have done a million times at work.