I have 1 P30L with plans to pick up 2 more in 9mm (V1 and V3) and I have 4 HK45's. I will say the P30L is my favorite of the P30's and I love the whole series. The HK45 is my favorite gun. It is the most balanced, and feels like it was designed around my hand.
They're solid guns and are good to go out of the box if you get the LE package with the Meprolight night sights. It's awesome in V1 DA/SA or even in Light LEM like I have as my carry gun. IT's also my fastest 45acp out there. I wish the P30L had the trigger of the HK45 so it was truly the 9mm version of the HK45 in some ways. That's the only thing holding the P30 series back IMO.. I would say jump in both feet first and don't look back. Wolvee who posts a lot less than he used to was a huge P30 guy and fought getting an HK45, he finally ended up with one, and instantly fell in love with it.
Also they're possibly the most underrated guns that HK currently makes. No one denies the performance or feel, it's about their previous love the USP 45 (which I also own multiples of) that's keeping them from loving the HK45 just as much. But it's definitely an amazing gun.