Other than I have two of the light strips that have failed and I am having trouble reaching the manufacture, these lights are very impressive. These are of a high quality construction. They are NOT cheap. My friend got something similar from Amazon and they are nothing compared to this set. I created a CAD layout in Sketchup so I could transfer the measurements exactly to the ceiling. I laid out a pattern with string on the ceiling and then put up the anchors using simple dimensional calculations from the CAD drawing (see my photos).I could not assemble the entire thing on the ground as I had a conference table below that is too heavy to move.This set is extremely solid and well made. The connectors were easy to use and simple to disconnect and reconnect when needed. The best thing about this set is that it has slip ring wire retainer mounts. You put the wire through them and you can raise and lower by pushing the connector (spring loaded). It allows you to get the height even and exact. It also allows one to play with the height to deal with obstruction and esthetics.I created an 8" spacer from PVC that I used to measure the exact distance from ceiling at each wire to adjust the exact height. I pulled the wire tight until the PVC spacer stopped the fixture at the exact 8" height. It made getting this plumb and level super easy (about a 45 minute task).These fixtures are BRIGHT. I mean SUPER bright. The three colors are a HUGE plus. I did not have to decide between warm white and bright white as I can change them on the fly. And I do change them. We keep them on the super blue like bright white during conferences and go with the soft white when watching a movie. My kids study with the medium color.The instructions with respect to the layout being in mm and not very clear are a problem, but if you look at my CAD drawing it gives all that is needed for a proper layout.I am hoping the manufacture contacts me about the two sections that no long illuminate to replace them. I will be ordering a 2nd one of these for a new project once I know I can get support.