Just FYI: Yesterday I installed iOS 12 official release on my iPhone 7 and iPad Pro 9.7". So far no issues at all. Not a whole lot of new stuff from iOS 11, but supposedly more stable and better performance. Too early to judge that, but at least the performance didn't go down. I'm just finished installing iOS 12 on my old iPad Mini 2. Installing iOS 11 on the mini iPad Mini 2 was a mistake because it definitely degraded performance very noticeably from that of iOS 10, so I hope iOS 12 will improve performance a bit.
Unrelated, but it looks like I'm going to have to pass on Mojave for my MBP as it can do ugly things to 32-bit apps, and unfortunately I have several of them installed including the Microsoft Office for Mac 2011 suite. BTW, you can determine which of your Mac apps are 32-bit by doing this:
- Click the Apple icon in the upper-left of the screen, select About this Mac.
- In the About this Mac popup, click the System Report... button.
- In the System Report... window, click Software -> Applications. (This will eventually display a list of apps, but it will take a while to generate it, so be patient.)
In the System Report... window, the last column named 64-Bit will indicate which apps are 64-bit and which are not. If it says "Yes" in that column, then it is 64-bit. No means that it is a 32-bit app and there might be issues running those in Mojave. You can sort that column clicking on the name "64-Bit" then scroll down to view all the "No" apps. Personally, I have too many 32-bit apps to risk using Mojave.