Have this on a Nokia. Nice and easy to use to Tweet, but I often find it slow to load, wanting to load each Follower in turn, not all simultaneously. Fiddly process to try and access links on this handset too.
Haven't seen a new version in a while which bums me out, although quite a nice app for BlackBerry Twitter clients. Mainly utilize socialscope now though for facebook integration, automatic full URLs when viewing tweets from the shortened URL, etc. Excited to try the new @tinytwitter beta coming out in March though. Just wish these Twitter clients actually communicated more with their users through Twitter or a blog, etc.
I really like this app. It does not look pretty but it has all the features you need. It even runs in the background and will update you when you have new tweets.
Works great except it keeps the original formatting (line spacing, etc) and sometimes a tweet won't fit in the screen.