I am probably a little behind but thought I would weigh in on the above.
First, my network is simple. SBS 2008 Standard, 8 WIN 7 Pro 64-bit and a myriad of printers. One of these is the TSP800. I do have the TSP800 II but I have not tested it with this version. After testing on two standalone machines, I installed v6.1.2 on all computers with the databases on the server.
I am happy to say that all 8 computers print perfectly to the TSP800. The prescription writer itself opens instantly as it did before the initial v6.
I would give the upgrade 5 stars instead of 4 1/2, since it still has the annoying bug of not remembering the check boxes next to the DEA# and License number. In fact, I still have my DEA# in the address field, which looks silly, but is a functional workaround so I don't continue to get calls from pharmacies when a controlled substance is on a script without a DEA#. They don't seem to have the same issue with my license number.
So, that is my review.