FWIW n=1 report:
once installation was sorted, everything has worked extremely well. I have A4 mk1, AR mk1, on Overhub connected to an i7-7700 Windows 10 PC working with Ableton 10.
with OB1.15, I had extreme difficulties getting A4 and AR to work simultaneously. with 2.0, everything is stable. OS upgrades were easy. the standalones are great. very nice step forward.
I should just count my blessings and work with what works, but I’m going to try OB with Cubase and see how that is. and now I will start thinking about DN, DT and AK mkii…