I did an inspection on this house and this is the worst PEX installation I have ever seen. This is to give you an idea of what to look for when you have a plumber installing PEX in your house.

Best tool for installing 1/2"-1" PEX-B: https://amzn.to/3Ax7t2b

Crimp rings I've used for years: https://amzn.to/3QWALwe