I like the iOS12 beta thus far, it's fast and reliable -- much more so than most first iOS betas I've tried.
The mobile view for AtariAge doesn't render correctly, unfortunately. There's too much header and not enough space to see what you're typing. For some reason, the URL page is full size instead of small. This is the only site where I've noticed this behavior.
I don't expect AtariAge to fix this, I'm just pointing it out so folks are aware. It won't be fully released until the fall when the new iPhones come out, hopefully long after AtariAge's forums are upgraded to use the responsive site instead of a mobile skin.