PEX: Is it worth replacing crimps with push connections?
God no! I've had two leaks, out of literally tens of thousands crimp conections. Both leaks were installer error. One time my tool suddenly went out of calibration which I could feel in the action and quickly remedied. The other time I crimped it way crooked and I returned the next day with my compound offset crimper, cut out the bad connection and recrimped. Push conections tend to leak if there is a lot of lateral tension applied to them. They are crazy expensive and inferior to crimp under certain circumstances.

Edit

Here's a crimp calibration tool



www.zoro.com

It's used to calibrate the tool and to inspect crimped fittings after the fact. If you find an that the calibration tool doesn't fit over then you should re-crimp them.