It works on Windows 7 64 Bit and Cakewalk X1c
Just upgraded studio hardware and software, but ran into periodic issues with previous midi interface. Previous interface drivers didn't yield consistent results so I purchased the UM-3G
Installed latest drivers for the UM-3G, connected everything and so far no issues with disappearing midi information, or midi drop out.
The unit is very light and compact, which can be good or bad depending on its location in your studio. The two in the back, one in front design doesn't seem to balance out well when all connections are used. In other words, it doesn't sit well on top of some surfaces. I think the midi ports should have been located in the rear, but hey I don't design these things, just use them.
Great unit for the price, and once again it works on Win 7 x64 and Sonar X1c