I'm running 10.10.2 and none of the "issues" have impacted me. All Adobe products and all my plug-ins for LR, PS, etc. run just fine. I do take advantage of a number of the new features. Perhaps most of all is the integration between my iPhone and Messages on my iMac. Oh yeah, I know this might be heresy but Pixelmator on Yosemite is excellent. YMMV