The quality is outstanding, as other reviewers have stated, and the installation is crazy simple. I ended up using a 1-1/8 spade bit to drill thru the deck boards; the 1" bit didn't provide enough space to insert the light. The hole is just a wee bit larger than the light, but you can use caulk or silicone to tighten it up. My only issue is that the lights are not as bright as I had hoped they would be, and the illumination is more cool than soft white.
Overall, great value and I would buy these again.