The new Sonar X2a is designed for multi-touch. I can see how nice it would be on a big touchscreen tilted down at an angle or on a tablet/ultrabook. It's would be annoying on a monitor that's up vertically of course but that's just the way it is.
Sonar has always been a supporter of Windows since the start. Ableton Live isn't particularly well suited for multitouch but it would be nice if Bitwig would support touch the way Sonar X2a does.