I've been using Veeam Backup and Replication 6.5 for a couple of weeks now with no issues, having upgrade (again, with no issues) from version 6.1. I'm not doing replication or anything fancy, just backing up some VMs, but I like it. The two biggest new features for me are the additional job scheduling choice of "Start after this other job" (which is LONG overdue - and every application that can schedule more than one task should take a page from Veeam and do it like this - just beautiful!). The other great addition is that Veeam ONE (Veeam's monitoring product, which you should totally rush out and buy) now can give you some really interesting metrics from the Veeam Backup and Replication infrastructure, such as how much data your backing up (so you can track growth!) and when you're going to run out of space, given the current backup trend in your organization. I am seeing slight improved performance, but honestly the product is so amazing to begin with (compared to something like.... uh.. Backup Exec), that I don't even care.
Another cool thing I ran across is that Veeam offers individuals certified by Microsoft or VMware a free license for "lab" use of Veeam. You can check that out here. I didn't see where they actually checked for your cert, so, uh, there's that.