Great thread.
I have been enjoying sonar in this way for at least a year. Maybe 2.
The stability and performance have made it truly enjoyable to use.
I am not looking into other DAWs at this time because I think it's premature. It doesn't make sense for such a successful product to be utterly abandoned.
I use sonar professionally in three capacities- as a teacher, it's an essential tool in my music classroom. As an engineer at The Gradwell House Studios, it's my DAW, and as the president of BlixYZ Records, it's the platform through which most, if not all of our releases are built.
I have used Reaper, and I have taught garage band and Logic at the Settlement School of music. I'm not afraid to switch to another DAW.
But I'm not going to until it's clear that that is necessary.