Peter, I had the NIK Collections and it's latest update prior to going with Yosemite. Actually, I upgraded my computer to a new rMBP and it came loaded with Yosemite. When all of my apps and files transferred via Migration Assistant from my Time Machine and I upgraded to the latest Aperture version, NIK worked just fine, either as a direct plug in or going through PS. I had waited for almost a month before buying the new computer so I followed Yosemite after originally starting this thread and saw that many people were using it so I went ahead with my purchase and test drove Yosemite and NIK and so far so good.