A frame with 28/12 pitch. We put up five rib screw down, the panels were 26'4" long. About 30 square, replacing the faded quickly failing cedar shakes installed sometime when the house was put up in the mid 70's.
There was a tornado here in '03 which meant all my neighbors got new shingles, and I got to put another bundle of shakes on mine the following January patching holes. No coverage, too old. But ours took the wind a lot better than the flatter roofs. It all had to come off later, of course, and we discovered that 1) cedar shakes are a great way to harbor a full population of brown recluse spiders, and two, we could clear a portion and roof it as we went, leaving very little exposed.
It's been up 15 years and the south side has faded, it's dark bronze which doesn't look noticeably different that the previous shakes. It doesn't stick out in the neighborhood scheme, either. I have one irritating leak when the wind blows from the NE in a drizzle - it leaks down a rafter onto the kitchen counter top. No big deal. Other than than, it sheds rain like nobody's business, we later added gutters which must hang below where snow won't rip them off when it breaks free in a winter thaw.
Noise - our previous dish washer was noisier, we have a cathedral ceiling in the living room and when it does start raining you pick up on it over the TV. Hail gets your attention, we've had serious incidents like the Joplin EF5 dumping two inches in our yard. Not a problem for us, tho. Screws do back out - a 26 foot piece will grow 1 inch from 70 to 120 degrees and that is what can rack them out. Put down the spun bonded house wrap underneath to give it a slip layer and it won't stick making a popping noise when the sun hits it. We've gotten used to it - it tells you the sun is out.
While I would do some of the installation details on the roofing job differently I would do metal again in a heartbeat. We have seen barns still wearing metal roofs for over 100 years - they might be rusting but it's been a long time and hay stays dry stored in them. Shingles and shakes, not so much, they are labor intensive, expensive, and short lived in comparison. Metal and tile are the long term winners, you don't see suburbanite shingling done on historic mansions. Shingles are one of those things where you get what you pay for, a cheap roof that won't last, and you get to do it again and again.