Thanks for the reply. I was looking for the opinion of some professionals. In your experience, is there any reason not to use them?From their website.
Push-to-connect design makes for quicker install times and fewer installation errors. Compatible with PEX, copper, CPVC, PE-RT and HDPE pipe. Transition fittings available for PVC and polybutylene. No special tools, crimping, glue or soldering required. Approved for underground and behind-the-wall applications.
Most pro's prefer pretty much anything else. That being said, during a Fieldwork meeting with a table full of plumbers, one of the owners said he preferred installing Sharkbite stops on PEX pipe. He didn't mention what he was using inside the walls. I would expect that like most of us, he was using expansion or crimp fittings for that.
When I use a push fitting like that, it's mainly in an accessible location. Almost never hidden for me.
They are nice going from PB to PEX or copper.