The edge will be clean and smooth. I have to cut out for my pipes. Again, using your drywall utility knife, score your cutout. Place your PermaBase on a solid surface and, using a hammer, hit around the inside edges of your cutout. Push the cutout through the panel and cut away any remaining fiberglass strands.
Some people use a router to do cutouts using a concrete tip.
It's so much lighter. How Wallboard Is Made Gypsum rock's road to wallboard, from the quarry to the crusher to the dryer.