I bought some of those little heads. It was very easy to mount them. They are very light (weight) so I could put a lot of them in a stand.
Pros:
-Really powerful light! Even in a daylight you could see the light!
-Very fast moving! Its amazing to see how fast it turns around
-A lot of preset ( i thing they are 7), it has stand-alone by music via mic, and also a very useful led screen to setup it!
Cons: It isnt a single light but they are 4 (R-G-B-W). So e.g. you dont have an Orange beam but one Green and one Red and it isnt that nice.
Anyway i m gonna buy some more :P