Not my favorite, either.

But black poly stands up to UV, freezing, and chemicals better than almost any other piping.

Pressure? Not so much.

And then there's low-grade (= Chinese) stuff out there with uncertain properties.

PS: One thing to keep in mind: virtually nothing sticks to polyethylene. You can weld it, with the right equipment (if you know how to 'hold your mouth right') but otherwise anything you do to it must be mechanical.