Easy to assemble. The fact that its 2 cables do not have color, for non-electricians like me, gave me a 50% chance of getting it right during the connection. I bought two pieces. In the first one, I guessed correctly. In the second one, I made a mistake, it blew my fuse ^^ and then I changed it and it worked fine. 4/5 because the crystals either are or resemble plastic.