Is this a good Twitter Program?

I am going to be buying a program to fallow people on twitter for clients and hope people will follow them.

IS this a good program or do you know of a better one?
http://tweetadder.com/purchase

What ever I buy I dont want there to be a limit to how many twitter accounts I can add,

Thanks for the help!

you have to check twidium

I havent used that one but I think the most popular is Tweet Attacks. I have it and it does just about anything you can think of. Search in this forum. There is a thread for it.