I agree it works fine on v1.0. The effects that I am mentioning are the ones from @bkamins’s list.
JLD2 works fine and has a stability upside due to its limited activity, but that does mean that support for the latest and greatest features will lag. Some of these features, like missing, can be pretty crucial in some communities so it’s important to note that there’s really no one who finds it their duty to add features to it daily/weekly.