I'm small time, only about 1 Ghash/s, but I'm still finding this to be more than profitable enough to continue. Granted you cant earn a living on it unless you have some serious hardware already, but I'm still making a good $200-300 USD a month after electricity. I'm still buying hardware. I'm even thinking of investing in actual cases and noise dampening foam. Think about it, miners that are compact AND quiet! MADNESS!