Does anyone have experience with TweetDeck?

Does anyone have any experience with it? It's in beta and I don't want it to mess up my computer.

it wont mess up your computer. it is a huge memory hog though so if your computer is old it might slow things down a bit.

Can I change the background color? Normally I leave those things as is but it's hard to read the white print against the black background.

Also, I'm not sure what all the columns are for. Do you know?