I'm following Ars Technica's advice and waiting for .1 or maybe .2 as iOS 13 rollout was less than stellar. Also won't be able to play Homeworld Remastered after the switch (not that I play that game much anymore). Which reminds me I still get nags about Steam not being 64bit (even though Activity Monitor says it is?) which means I might have to do some gymnastics to get that working again.
As for the features, well both my iMac and my iPad are too old for sidecar and that was the only real thing I was looking forward to.