I have used dichroics on occasion. Sometimes I designer needs the purity of color that you get from them, and sometimes they like them for the funky colors that you can get with them. I also use the 2" rounds in the MR-16 track lighting above my
desk in the booth because I was tired of replacing
gel. It is true though, people walk in the booth and wonder where the blue light is coming from since the off angle of the
dichroic looks pink-ish.