Just installed the app. Looks slick, but the tab bar is a bit too high for my taste. The Profile tab doesn't work for me, it returns a 'connection error' message. The Global feed, Timeline, and Mentions tabs work. Conversation view doesn't always load, especially when not connected over WiFi. Scrolling is as smooth as Twitter's app and it has infinite scroll. Oddly, the messages from user 'alpha' (App.net's App.net account) show up empty, while they contain content when viewed in the web interface.