Yes I am using it. Works great, but one MAJOR issue is Exchange Recovery. If you use the Full Information Store backup, choose the option for individual message restore, restore of the message sucks. You actually have to take down the entire store just to restore one message. So if you wanted to restore during working hours, the new feature of 11d would not work. However, the method of using 2003 Recovery Storage groups still works great.
The individual mailbox backup method works great, you can restore individual items to live database, but it is slow to backup.
Despite these deficiencies, BE 11d is one of the better backup programs out there.