The best.

So the program itself gets 5* cause its the best Twitter client for iOS. I took away one star due to the fact that while other programs give you big updates for free, TweetBot makers are forcing us to pay for each big update. It was the same with TweetBot 2 and 3.
I would normally take away 2 stars for that but this time the update gives you an iPad version too which is cool.

Mikaoellion about Tweetbot 5 for Twitter, v4.0