If you're talking about Tweeten, which is just a mini web browser showing a specialized part of their website, then you fell right for their marketing schemes.
We were talking about Tweetdeck, if you change the context of the conversation, it's polite to actually mention that.
As for that "client", it's just twitter. And it's just Twitter in a mini web browser. It's not tweetdeck. It's literally only useful for people who for some reason can't go to the actual website. It offers no extra features.
