Sharkbite Fittings

This plumber explains why he doesn't use them - citing higher potential for leaks:

• Push-fit leak more - [1]
• Stay away from push-fit, but clear reason is not given [2]
• Reliable but soldering is better [3]
• Sharkbite says PEX lasts longer than copper [4]
• M type copper lasts 20, L type lasts 50, and K type lasts 100 [5]