I use On1, but not Nik (I have the old version somewhere, maybe). I haven't seen anything from On1 about adding Nik (it comes from DxO). On1 doesn't really "force" updates. You don't have to buy the next version unless you want the new things they've added. At least if you buy On1, you own it. BUT, I don't know if it works as well on PCs as it does on a Mac (I use an iMac). Someone I know who used it has a PC and was frequently finding bugs. I didn't have the same bugs and have rarely (knock on wood) had any. On1 does really have a lot of cool features and ways to add textures and other things non-destructively. I've gotten used to how it works and uses masks, so I like it. But I can't help you with tying it to Nik.