Pros:
I wanted to replace a similar Mercury Vapor (175 watt) unit about 10 years old with a Metal Halide (100 watt) unit due to the latter's energy efficiency. I again chose the Cooper unit because mounting it is a snap. A metal bracket is screwed to the mounting surface, the lamp fixture is dropped over a heavy metal pin in the bracket, the wiring is connected, the lamp fixture is swung back against the bracket, and a metal pin is dropped through the fixture into the mounting bracket. Done! This was important to me since the fixture is located 35 feet in the air. Overall, this unit is truly "industrial grade."
Cons:
"Out-of-the box" assembly involved unsnapping a couple latches to remove the plastic globe, installing the lamp, reinstalling the globe, and installing the photo-electric cell. The latter presented a problem in that I was unable to twist and lock it in position after numerous attempts. A call and email with a photo of my problem to Cooper's Customer Service representative resulted in the following response from them: "You should receive a new fixture in the next 3-5 business days. Thank you." Problem solved in less than three hours.
Overall:
Product: 5 stars, notwithstanding the photo-electric cell problem.
Cooper's Customer Service: 5 stars.
As usual, Amazon's service was exemplary.