Does anyone know or have they tried to run the latest version of Sonar Professional on a Microsoft Surface 3 
tablet running Windows 8.1 64bit? Thank you in advance

Yes it works fine with Surface 3. Dan Gonzalez from product marketing has a Surface 3 and has tested with it.

Thanks for the quick reply

I get a lot of latency between my MIDI controller and my Soft Synths when using my Surface 3 (not Pro).  I usually only have (2) soft synths loaded (Z3ta and Rapture) and use my Roland FA-06 for the rest of my sound set for MIDI playback.  Any other Surface 3 users experience the latency issue?  I'll not that when I change the buffer setting, the latency reduces but it causes the stuttering distortion issue (not really sure how to describe it) as a direct result of decreasing the buffer size.  I don't run any other apps on my tablet when Sonar X3 is open, BTW.

Pro vs. Non-Pro Surfaces have very different specs. I'd assume the performance characteristics would differ fairly significantly.