In the process of finishing up replumbing an old house with pex. Here is the central manifold A shot of the pex runs in the joists. The tankless water heater that will feed it. And here is the upstairs hall closet I converted into a laundry closet. Those are Sharkbite connectors for the hot and cold water, if you can see them. Worked great. No leaks (the threads above them leaked a little though) and installation is literally a question of pushing them on. For small projects they are great, though a bit cost prohibitive on larger ones. I used a sharkbite on a hot water line for three years at the cabin and it never leaked a drop.