I am VERY interested in buying a touch screen for SONAR for my dell studio 1747 laptop (now running WIN 10, with benefits).
MY CONTEXT AND OBSERVATIONS I, for one, am bad as SH** when I try to setup any control surfaces that does NOT come with presets for SONAR (and I seem to have the habit to be interested mainly by controllers that DOES NOT offers presets for SONAR...) The result being that I am just partly using my MKP mini controller and I am almost never properly unsing my Yamaha 01v96 as a controller for Sonar. (I know there is ACT and messed around with it... i'll get it eventually...)
So, my experience with SONAR and control surfaces so far: very frustrating (But it is mainly my fault, as I am not good with work-arounds when presets are not avail...)
My opinion is: touch is the future (as a lot of controllers seems not to work properly right out of the box with SONAR. The most common problem being "The controller sends messages to Sonar correctly, but does not seems to receive some messages back from it..."
Touch solutions will be more affordable than controllers offering "motorized faders" and the likes. Reaction to the DAW's / PLUGIN's current state is ESSENTIAL to a workflow using a controller. I much prefer mixing only 1 parameter with a mouse knowing at what value I am starting FROM instead of messing with 8 non-motorized fader by first putting the thing BACK at the value showed in the daw BEFORE actually being able to input the values I want to at that moment... Also, current affordable controllers almost NEVER support motorized faders. Heck, even INFINITE ROTARY ENCODERS seems to be a luxury (I cannot believe that new controllers are still offering only "FINITE" rotary encoders... a complete non-sense for me... the new BEHRINGER line seems to be getting the idea...)
The MICROSOFT SURFACE as a controller combo using REMOTE DESKTOP seems promising. I would like to try it but I want to be able to use the surface AND work locally on that laptop at the same time (Isn't a remote desktop session logging off the "local" session of the machine it is connected to?)... So, have not yet looked into it.
MY (hopefully correct) CONCLUSIONS For touch to really take momentum in Sonar, a lot of work still needs to be done in the UI (the sooner the better). For me, updates to the CONSOLE VIEW's code to allow us to configure displayed parameters to better react to any finger size is essential (same applies to any of the DAW'S windows IMO).
Putting work into CODE development to better support natively ANY touch device, instead of new CONTROL SURFACES designs for the next 2-3 years, WILL be profitable. Afterwards, there will still be time for Tascam to develop good (and affordable) controllers flexible enough for the 2020's. Heck, I am thinking of a product that could offer 1-2 motorized faders, infinite rotary controllers and a touch surface. I think AKAI is offering things like this now. More like those needed....
TOUCH MONITORS will still have the better advantage for me, as I would be able to use it with other softwares. So any control surface having a too high price-tag will not be considered by the semi-pro-hobbyist audio producer that I am.
... BUT... I will only be buying a touch monitor IF the bakers are rolling out some new features in that area... full circle, chicken / egg situation...
Hope this helps a little.