Also RE: fear for lack of Support.
On the driver side - Roland does a very decent job of driver support for it's products and tends to release drivers even for products that are no longer in active production. I can't imagine they would stop this trend, and for the 700R owners they can't sell you a fantom chip expansion if the unit won't work with your computer anymore.
On the control surface side it is true that we open-sourced all of the control surface plugins that we built. The 700C in particular is a great example of some of the additional functionality that can be added to a control surface (things like xray etc). We do not have any plans of dropping support for this in SONAR and there are actually a few geeks at Cakewalk that have been
ninja-adding features to various control surface plugins and the SDK. Including a
longstanding MCU bug with non-mackie controllers.