I am a licensed general contractor and cant believe anybody would give this more than 1 star. My use for these panels was as a temporary barrier between wood and some excavated dirt so I wasnt too concerned about their condition, BUT, i left a stack of 5 pieces in the yard for one day, mild weather, in the low 70’s. The next day the stack had warped and twisted and even melted together and cracked when trying to seperate them. These junk panels crack far too easily and cannot take a fastener unless you pre-drill a hole. Its unbelievable that these are manufactured and sold as a roofing panel because they couldnt last one full day of mild weather. If you are unfortunate enough to be using this product as intended do not cut them with a circular saw or with a masonary blade, as someone else had suggested. Easiest way is with a pair of tin-snips / sheet metal sheers. Best to avoid this junk. Shame on you Home Depot
A lot of reviews say they're cheap (they are) and break easily, but I didn't encounter that while working with them. Wanted an inexpensive solution to cover a bunny hutch, to keep them out of the rain. Found them fairly pliable, cut it to size with some tin snips fairly easily, and used a small pilot drill before attaching the sections with small sheet metal screws. I can't say yet for the durability, but if a large branch breaks off and shatters them, at least it will be cheap to replace it. Wouldn't use it on my house, but good fit for small projects.
I purchased these panels to cover most of my chicken's run. (Yes, they are spoiled chickens.) They were easy and quick to install. I had some trouble cutting them with a tin snips. They cracked and chipped as they are pretty brittle when cold. I had much better luck cutting them with a saber-saw and abrasive blade. I pre-drilled each hole before screwing them down to prevent cracking. I added a dab of RTV to each screw to make sure they didn't leak. Be careful when laying them out to keep the edges even. It is easy to get them screwed down too tight and it adds a tiny bit to the width. The errors accumulate as you work your way across the roof. Chickens are warm and dry now.
This review is based on ease of installation, etc., not on longevity. We've only just installed them as vertical walls on a greenhouse. They are easy to install, have great clarity. Be careful while cutting, as they are easy to crack. I can't say how well they will last, or if they will cloud up after a few months/years in the sun.