I am a music major at college, not a theater major, but I do know how to run a board (basically). I have had the distinct displeasure of working with four DJ grade NSI dimmers. We are running about 16 Altman Lekos, and the dimmers are fused with cartridge fuses no bigger than what you find in x-mas lights. Now, my dept. has an opera/musical theater program which puts on a show every year, and the last couple of years we've been doing it in our space (though we hope to do it next door in the brand new black box which has nice new ETC dimmers, next year), anyhow, these fuses like to blow at the slightest thought of over load (although I'm not sure we really have the right fuses), and the worst part is that the fuses are in these four little chambers on the bottom of the dimmers, and if you accidentally put the cover(s) for theses chambers back in/on with no fuse in there you'll never get them off/out to put a fuse in there. If it were up to me, and if the dept. actually had any money to work with, I'd deep six those !@#$%^ NSI dimmers and re wire the place so they could run off of a portable dimmer unit (like a portable Sensor+, or CD 80). So, those are the worst dimmers I've worked with, how about you?