I have the MC stock ones, and I love them. They are beautiful at night, and really add an atmosphere that I dont want to ever give up. Its a little hard to surf with them on if you arent weighted properly, as the lights wont always be underwater and shine and your eyes. I will say I wish I could change the colors on mine with a switch or with my onboard computer (the technology exists... common MC get with it).
I will say, I know for a fact that it makes me more visible at night. Which if anyone has ever driven a lot at night in a boat, knows thats a good thing, as people get a bit tipsy, not always pay attention, etc. So I find people give me a lot more room when I have them on.