macOS Catalina
I've been on the beta for a while.  I'm sort of surprised that they actually released with the state it is currently in.  Most things work, but my CPU still spikes for no reason running some OS process or another.<p>Also, clicking on a dropdown box in a web browser (Safari, Chrome, or Firefox) after the computer has been asleep for a while freezes the whole computer for about 10 seconds.<p>Maybe it's just me, but that feels like a showstopper.<p>The whole 32/64 bit thing doesn't seem too bad, although I've had to use Pages instead of Word and can't use Adobe products anymore and have had to switch to open source alternatives, but I don't use those products very much so it wasn't a huge deal for me.