Just in case it helps anyone: I tried iOS 27 Developer Beta 3 on an iPhone 16 Pro Max and ended up reverting to iOS 26.5.2. The reason was the battery. In my case, it was draining significantly faster than usual. I also noticed some occasional stuttering, though nothing too serious. Aside from that, I actually liked the system. It feels very fast, apps open almost instantly, and it seems like Apple is on the right track with iOS 27. For my daily use, however, I prefer to sacrifice a bit of that speed in exchange for much more consistent battery life. Once Apple finishes fine-tuning the battery performance, I’ll probably give it another shot. Obviously, this was my experience on the 16 Pro Max; others might have a different experience.