HTC Peep was ok but honestly it use to wind me up when it wouldn’t update when the storage was quite low. No warning either. Gwibber was great but I found it slow when adding lots of columns. I tend to have a column for all the people I’m following (home) one for replies (@replies) and finally one for Private messages (d msgs). On top of that I have searches for events and the such things. Tweetdeck handles these pretty much in its stride, but Gwibber use to do odd things.
I think it might have something to do with being connected to Twitter x2, Identi.ca, Facebook and other services.
The one thing I do miss from Tweetdeck is the ability to connect to a identica and status.net server. Instead there’s accounts for Facebook (which actually works very well) and Google Buzz. Honestly I’d switch out Buzz for status.net anyday.
I don’t know how the news Twitter might buy Tweetdeck will effect everything but it looks like status.net and even the open microblogging standard isn’t coming any time soon. I may switch back one day, specially if Gwibber 3.0 is as good as it could be.