I'm using 3 Antminers since today. (They give me about 1.9 Gh each, not overclocked yet- will do in a couple of days) And I'm using a 60 Gh ButterflyLab miner. (That's flat out !)
Beware to use thew right driver before you start mining. To get all my devices running like they should cost me a lot of blood sweat and tears. Try Youtube for some info. I am running all my miners on BFGMiner now. Saving money to buy about 300 Gh extra mining power in the next couple of months. Slush is my first and favorite mining pool !