Product review (4 stars): Horrible shut off valve
The PEX does what it's suppose to do and is easy to work with.  The 1/4" inline push fitting is great.  The shut off valve is a piece of junk.

I installed this kit to run an under sink UV filter to an ice maker.  Water very slowly dripped from behind the face of the shut off valve for an hour.  Also the shut off valve won't turn from the open to the closed position.  The drip stopped after an hour but the valve still won't budge.  For me, instead of being a shut off valve, it's just a tee.  The shut off tee is made by a company called SeaTech.  I will avoid their products in the future.