I can't really recommend the UI design, but it does work well. In particular, its implementation of filtering (and here we hit the reason Twitter would hardly mourn the end of third party clients) is simple and complete, permitting me to be rid of autotweets from the likes of FourSquare and RunKeeper.

As a consequence, I haven't used Twitter's website in months.

Ah well. If Twitter should wither, it's been an interesting ride; however, I suspect it's reached Fcbk inherent security of position.

That said, if anyone knows of a genuine (ie not a poll on a random website) survey on people's usage of Twitter, I'd be most interested to see how the public at large uses Twitter, and who's heard of Twitter's edging away from third party clients.

Tweetbot for the Mac is a lot better, not sure if it is still available for download.