I don't use pantiliners, at least not on an everyday basis. I only use the plastic-based ones when I have my period (those light days).
I first used Carefree Pantiliners when I was still in college, back during the days when Carefree was probably the only known brand of pantiliners. I was persuaded by TV commercials that I would have fresh panties all the time, and so I started wearing them.
But I don't like Carefree pantiliners on an everyday capacity. Sure, my panties are fress because whatever discharges don't directly go to the undies. But I can't stand the smell! I don't know but wearing pantiliners probably encourage bacterial growth down there that I actually smell awful! And this is specially awkward for me whenever I sit down to pee and get to smell myself unintentionally. Yuck!
But since my menstrual flow is almost always light, I just use Carefree during my light days. When the blood is gone, no more pantiliners for me. I feel fresher and smell cleaner this way.