Those reverbs are some of the very best available.
R4 for character and lush (style ValhallaVintageVerb).
Nimbus for smooth and natural (style ValhallaRoom).
Good one indeed. Still not sure O9A is worth the upgrade (on its own). That low end thing as just part of the spectral shaper so nothing new. Still like the GUI rescalability and the NKS compatibility though.
On the other hand, most of these improvements are now also part of Ozone Standard, as are all Vintage effects, and this for the first time. Upgrading from O8S to O9S seems to offer best value for money here.