In general, I like it.
I haven't turned it off... so it isn't that big of a distraction.
Problem Use Case:
I often close a project and go to Windows Explorer to manipulate the file. Maybe add tags to the Wavs or send them to the musicians to check them out.
Current Behavior:
I close the project, open Windows explorer, and then focus is set back on Sonar as the Start Screen starts up. This leaves me with extra clicks to get back to Windows Explorer.
Old Behavior:
I close the project and switch to Windows Explorer. Sonar did not used to inject itself into focus.