backup exec 2014 v-ray edition

is the v-ray edition doesn't need an agent on the windows/linux vm like veambackup?  does it mean i can use ms vss shadow copy instead of backupexec vss and there will be big benefit on vpshere replication?  because if i use the agent of backup exec, meaning i can't use ms vss therefore doing replication on production time will give more utilization on the vm therefore some applications may get affected like exchange or sql.  and snap shot will be faster on ms vss?

thanks for any comment you may add.