I installed ipadOS 18.1 beta and turned on Apple Intelligence (there's a "waitlist" in settings for it, but the only wait is for the components to download). So far, most impressed with the summaries in Mail, which instantly useful. But you have to click the summary button every time - they should be on by default - and sometimes they are too short.
Hey journos: The summaries are REALLY useful for evaluating press releases (and for the quick nuking of irrelevant ones).