If you manage to convince Roland resign drivers for Win10 (VS-700 and VS-20), it is nice.
VS-700 ACT part is open source (except graphics). And I have not found something bad in it.
To bring it "up to date", a ton of bugs should be fixed in Sonar side ACT layer and deeper, bringing it "up to date".But if you going to do this, I may consider to re-think targets of "AZ Controller 2" (currently in planning and "checking the ground" of another DAW).