The app was laggy on my Galaxy S, but it runs like butter on my Nexus 4 and Nexus 7. I think there was an update to fix the speed issues in the latest version.
The widget is kind of garbage right now, imo. The standalone app though is extremely solid. I loved the official Twitter app for its simplicity, but there were some issues with it (e.g., Lists were extremely if not impossible to get to). With this app, the UI and UX are impressive, because all you have to do is swipe left and you have all of your menus, middle screen has your timeline and direct messages (you can switch between the two with the tap of a button), and swipe right for your lists and trending tweets. Well worth the $1 if you're looking for something more, but I guess if the official app is good enough then there's no point in buying this

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Eh, I don't have too many either. I just have Simple Calendar Widget, the photo frame, and the stock digital clock. I'm not a fan of clutter, hehe.