When price matters more than quality, plumbing will always suffer. Sharkbites are great for fast temporary repairs. they are great for testing. Would I put a fitting with a rubber O ring in it in a concealed wall? Never. Want to have some fun? Cut a 1/2" copper line. Put a sharkbite coupling in place. Turn on the water and then flex the pipe where the coupling is. See the leak? You will. I have a rule. If I can't afford to do it right then I just don't do it. Price should never be the deciding factor. Essentially what you are asking is "Is there an el cheepo way to get out of doing this job right?"