After some time with these lights here is what I will say so far:
Connecting them together in a long line is proving to be a challenge. There is not enough support with the connecting plates they supply. They will sag and bounce around. Some sort of bracket will need to be purchased or built to mount them in that way.
When KC mounts more than two lights together, the backing bracket, or whatever they call it, is different than these lights. KC's are more supported from the back to handle the weight of several lights strung together.
These lights come as just the housing with some hardware, brackets, and a clear plastic cover to go across two lights. Unlike the KC lights which come with individual faceplates, lenses, etc. See the attached diagram of the KC lights.
My jumper wires that came with my lights were too long and the ring terminal was too small for the posts. I could've made new ones, but I made these work by driving out the ring slightly. So it would seem that theres an issue with consistency, which honestly is kind of expected I guess.
No wiring harness is included with these lights. Which wasn't a huge deal for me since I usually cut off most of the harness to connect to my auxbeam switch panel.
Ultimately though the lights seem built well enough and are bright when i bench tested them. Not sure about longevity or ability to take abuse as I haven't mounted them yet. I haven't figured out how I'm going to mount them in the configuration that I wanted them. I want them in a straight line at the front of my roof rack ( FYI, spot beams should be placed up high as a general rule). But the little connect brace they supply is not holding them stiff enough or supported enough to keep them from sagging. So if I can't find some bracket to support them, I'll probably have to fabricate something.
you can see how it sags when picked up from the ends.
wires were too long and ring terminal didn't fit
I flattened the lights by pressing back down on the ends. The flex I was talking about.
These connecting plates just don't support the lights enough on their own.