Product review (2 stars): Polyethylene line developed pinhole leaks over time.
I used 10 feet of polyethylene tubing for my refrigerator.  It worked fine for several years and then one morning I walked into the kitchen to find the floor covered with water.  The tubing had developed a pinhole leak.  I thought it was just a fluke so I cut off the section with the hole and reattached to to the fridge,  Several months later another pinhole leak.  I replaced with a Pex line.  Based on my experience I would only use Pex or copper line.