It's nice that these plug in, but also give directions if you'd like to hardwire them.  I found the parts to be a bit cheap, there is a lot of wobble in the back plate mounting with the weight of the arm + bulb + glass shade on it.  Definitely feels like it'd bend or break pretty quickly.

I had to find other ways to secure the entire thing to the wall better, and give some stability and peace of mind.