I use it for parallel recording of A4 and AR.
Never had any trouble with this, works great.
I just regret it's not possible to get all the tracks for AR, but I use AR separate outs to compensate.
I tried once to record automations in Live while turning AR knobs and it worked great. Pretty cool to identify sweet spots, edit and copy/paste.
Just not my workflow.
I havent upgraded to 1.15 yet, I updated to the previous version recently...
For me OB is a good thing and well done.
A facilitator when it comes to recording.
No stability pb with MBP late '11 + Live.