I carry the PF-9 all day (except at work for the three days I'm there; not permitted.) On my days off, it's on me 10-18 hours at a time, and I don't feel it at all. I carry it in an IWB holster, but it's worn between the belt and pants, not inside the pants. I had started carrying IWB, and originally with a Bersa Thunder, but switched to the inside-the-belt (ITB) carry for comfort reasons. I'm happy with the PF-9 (I am with the bigger Bersa, too, but had just happened to come across the PF-9 and couldn't pass it up for the price.)