Found a couple of interesting and informative threads re PowerPath/VE at the VMware Communities.  some are older....

Discussion:  EMC PowerPath/VE with vSphere 4 Enterprise

Discussion:  PowerPath/VE install to vSphere 4

Discussion:  vSphere and PowerPath/VE - Maximum LUNs to a host and maximum paths to a LUN

Discussion:   PowerPath/VE 5.4 SP1 now available - Tracking issues

Feel free to add links to valuable threads to this string or create another.  There are tons at VMware Communities.