I have a set on both my P30's. No POI issues, but I've used HD's on every handgun I own and have had them since day one with each P30 so I may not be best equipped to answer that question. They are fantastic sights, the front site is easy to pick up with the U notch rear. I have both the yellow and orange, prefer orange. I will say that accuracy wise they are great, however at distance the front post tends to cover a lot of the target. If you're comparing them to a competition type fiber optic sight then its a noticeable difference.
Now, the negatives. Sharp edges, every set I've owned has been a bit pointy. It's just the design. Can they be rounded, maybe. The only time I notice it is when I appendix carry, and that has been less often than not lately. If you use a hybrid type holster or even a full leather chances are the sights will never contact your body. Kydex holsters even with full shields generally do not provide coverage for the sights.
The sights may require some fitment or adjustment/ filing. Any qualified gunsmith could help you, there is a gentleman on the board here called teufelshund. He does excellent work.
In all, I love them and thats why they adorn all of my firearms. I've run xs sights, heine, dawson, oem night sights and I've concluded that the HD's work best for me. I know they are a slight investment, especially after paying for an install.