Fun colors and entrance/exit animations. Surprising list of integrations (albeit not all baked and polished). Mildly disorienting IA for the top-level UX nodes.
Is there any way to enter a phone number/email to invite someone?
There's one serious issue with trustworthiness: unclear (on the very spammy side) FB invite mechanic.
I tapped a button in the onboarding flow that said something like "Invite FB friends", with an expectation that there would either be (a) a picker on the following screen to choose individual friends to send invites to, or (b) an explanation of the sharing mechanic. Instead, the button simply changed state after I tapped it and gave a hint that all of my FB friends had been unintentionally spammed. Intentional growth tactic or unintentional UX oversight, that's a bullshit move.
Text chats in the app are triggering some weird card-ization of low-salience phrases (NLP parser polish!), and tapping on those random inline cards opens a safari webview that has a broken back button (on iOS 10); need to kill and restart the app after navigating into this webview implementation.
Also, notifications and unread badge count states aren't reliable right now: some notifications are arriving out of sequence, and badge counts are flickering.
