I love the idea of this product, it can save you a lot of cable mess and also some installation time. You only need one power and dmx feed, and if you use some 0.5 m dmx and power cables, it's very little cable mess. I use it with a wireless DMX receiver as well, so it's just to connect it to one power outlet and mount it on the site - plug and play!
On the negative side, it's no description on how to assemble the nuts and bolts, and the fixture bolts are maybe a bit too long - but you can change them if needed. I also wish there was a stronger version, that could take some more weight.
But worth the investment, if you want a clean and mobile rig!