Do Strap Happy Clips Work Well?

I am tired of fighting with my bra straps to keep them from showing when I wear some of my favorite shirts, so I am trying to find a solution. I don’t want to have to get a whole bunch of different bras to wear depending on the top that I am wearing, so the idea of the strap happy clips that I saw advertised on TV the other day appeals to me. Can anyone tell me if these really work well? I am worried that maybe they might make lumps or something under my shirt. Can anyone tell me where I might be able to find some customer reviews for these?