I have minimal experience with Sonar, so take what I say with a grain a salt and definite reach out to the ROLI tech support for a more definitive answer.  
 
The RISE works well with several DAWs I've tried (Logic X, MainStage, Reaper, etc.) and they include BitWig with purchase.  I know that BitWig specifically supports MPE, which I THINK is not the case with all DAWs.   Again, check with ROLI on this. 
 
Using any of the ROLI products can be pretty CPU intensive since you are essentially running all of those MIDI channels simultaneously in order to achieve polyphonic pitch bend (bending in right hand won't impact the notes sustained in the left and vice versa).  I also use the instrument almost exclusively for live performance, so I am usually ok to use Equator as a stand alone synth.  
 
I think the latency would depend on your system capabilities.  Just verify with ROLI support that Sonar and Equator get along!  
 
Sorry I couldn't be of more help!
 
Neil