I went to the LFS today and one of the owners gave me 3 dimmers to try out and see which ones work and which ones don't. They have never used them so he wasn't sure about them. There are 2 Solar 1000 and one Solar 750 dimmers. He also said that if they all work I can keep one for myself and I am hoping to keep a Solar 1000......How good are these dimmer/controllers?