Sorry for the late answer. I had to try 3 browsers before I could get in! Thanks, Joemike for your input. Anyone else?
IMHO the only con is the same as any other MacOS upgrade, you will need to upgrade/update a lot of apps for full compatibility. As to the pros, security is tighter (which does mean an extra step or two when passwords are involved), it is stable, fast, and has a plethora of cool new features. D