This light is amazing, very good for uplighting and they are light weight and have a sleek design. They are good for smaller venues, either to flood the dance floor or place them in the corners and special location for a nice effect. What I did were combining them with the ADJ Magna Tube for pretty effect.
Positive or negative things? There aren't many negative things I can say about the light, I have two smaller complains. The UV diode aren't extremely powerful enough to only use it for flooding the dance floor with UV, but it does bring a really good colour combination. So defiantly worth it. Other than that, it's annoying you have to do some customization to make it fit for the Magna Tube, but it wasn't build for this light so it is okay.
The light is cheap, compact, light weight and really worth its value. It is a good addition for our light setup, but they lose their intensity in larger venues and you will have to upgrade. But all in all, 4.5/5.0, really good light.