Pros 
- Download for free via iTunes or Google Play
- User-friendly design
- The app contains nearly all the features a user can find on the website
- Good security tools
- Multiple accounts
- Group and private direct messages
- Built-in photo editing
- Live streaming events
- People and Tweets search.
Cons 
- Ad Tweets and reordered timeline
- Scheduled publishing is not supported
- A timeline is not always chronological
- High res pictures may freeze the app.