I' ve used payless a couple times, when their price was much lower than everyone else. No probs.
I usually compare prices on Southwest website, as I Try to use Rapid rewards partners whenever poss.
But if payless is much lower? I wouldn't hesitate using them.
I even had a prob. with a lite that broke, and they took care of it. Didnt try to screw me over,
so thats another reason I would recommend them.