We've had the Essentials (User Essentials, Moderator Essentials, Conversation Essentials) installed for a long time now.
Recently the number of upgrades made to each is very much appreciated indeed.
When I look at the feature list for User Essentials, for many of the items I'm like "Uh oh this wasn't part of XenForo core?"
The features provided by User Ess have become so ingrained that it's difficult to imagine using the forum without the add-on.
Very few issues over the years, everything works as expected. Glad to recommend.