I've been using M+ since it was first released and I love it. Because I have read the complaints of others on here, and because I haven't been interested in most of the newer features, I haven't updated my M+ for a long time. It has been really stable and only crashed in use once, and I don't feel like it's missing anything. So I am cautious about updating it in case it works less well afterwards. I am definitely not interested in using Kontakt libraries and stuff like that. The only thing I really miss from newer versions is the ability to use ensembles made on Reaktor 6.5. So how are people finding M+ after updating, in terms of stability and CPU use?