Yep
For me, it's about weight. My PF-9 is super lightweight, and with the belt clip, I just clip it inside my pants for easy, secure carry.
In the summer months, I wear shorts, shorts, and more shorts- and most have elastic waistbands and no belt loops. So for me, I can just slip the pistol in the side of my waistband and don't have to worry about the weight of the weapon being uncomfortable or pulling my pants down.
Also, with the chrome slide, rust is not an issue on those balmy summer days.
When people do see the weapon secured at my waist, they almost always say "what kind of knife is that"?
As Massad Ayoob says, if you have a ccl, you need to carry ALL THE TIME, cause the one time you don't is when Murphy's Law is going to bite you. So if you have a big, bulky weapon that's difficult to carry on ALL your clothing, then you will either be forced to compromise your comfort or your carry; with the PF-9, I don't have to compromise either.