Obviously there is no perfect app. What different people want from the same app varies widely. What I want isn't going to be the same as what somebody else wants.

That said, at the minute there is no mac twitter app that really excites me. The problem is this; you can either have great design or good functionality but not both.

This is a problem that exists across a lot of apps and I think it comes down to who is driving the apps development. Is it a designer or a developer?

There are mac twitter apps out there which have obviously been design driven. Tweetie is a great example of this. The functionality is fairly basic but it looks beautiful.

Then there are apps developed by techies. These apps generally stuffed with features but lack the gorgeous UX that makes it a pleasurable experience. Tweetdeck is a good example. An incredibly powerful app but looks as ugly as hell.

What I want is something that has the UX of tweetie but includes more functionality like filters and scheduled posts.

Hopefully that answers your question.