Yes it is. Most definitely the best one on the iPad right now. Has the look and elegance of Twitterific Premium and all the power of the rest combined.
I just went Tweetings on both the iPad and the iPhone. I looked at Osfoora and have a hard time justifying another purchase based on feature set alone.
Try taking a look at "Tweets" for iPad. It's got a pretty cool interface, some great features, and is pretty intuitive to use. I think it beats the other guys hands down.