I've typically tried to stay up-to-date on my Apple software, but I held off after reading of plugin problems with Aperture 3.4.2 and 3.4.3 — particularly related to Nik plugins. I'd like to take the jump to 3.4.3 (as well as Mountain Lion) but I've not heard of a definite fix to this problem.
My question is, how wide spread is the plugin problem with 3.4.3? Is it affecting 10% or 90% of Aperture users? I'd like to know what my odds are.