I have had the pleasure of owning P30L's in both the traditional SA/DA configuration (v3) and in HK's proprietary LEM trigger configuration (v1). I will say that, hands down, the P30 series represents the absolute pinnacle in modern handgun ergonomic engineering. You can actually make this gun fit both your hands and your shooting style. And once you get used to the ambi mag release, you will wonder why all gun makers don't adopt this system. It is by far the easiest to use and fastest mag release I have used.
With 3 different sizes of interchangeable grip side panels (6 total panels, 3 right and 3 left in S, M and L) and 3 different interchangeable backstraps (also in S, M and L) there are 54 total possible combinations. Talk about a custom fit! It might seem like a strange idea, at first, to mix and match the different sized side panels but it makes for a custom fit for a 2-handed grip. Try it, you'll be surprised; the difference is subtle but noticeable. The problem, if you can call it that, is that there are almost too many choices! You can really get carried away trying every possible combination...
The DA/SA trigger is decent in SA but horrid in DA, like all HK's. The LEM (or CDA as it's called in Europe) trigger is a thing of beauty and has to be shot to be truly appreciated, IMO. If you know how to work the trigger reset, the pull is a respectable length, with a very crisp but light (4.5 lb.) break. As far as hammer fired pistols go, the LEM is unrivaled. It is incorrect to refer to it as a DAO trigger as it acts more like a striker fired pistol in that the hammer is partially cocked during the cycling of the action.
The only real downside to the P30 series of pistols is their price. They are quite spendy for a polymer pistol... For some, it is difficult to justify spending twice as much as a Glock or an M&P on a single gun.... But that decision is a personal one and only you can decide whether or not the gun is worth the higher investment. Oh, and the mags can be a bit pricey ($75 ea. on average) and sometimes hard to find.
There are holsters showing up on the market for the P30 but not so many for the P30L. But that being said, kydex holster maker, Comp-tac, does make all of their designs for the P30L as well as the P30. They make great gear and have a very strong following in the US. You can only order direct form Comp-tac but they do international shipping. I have ordered from them a few times and have had no problems whatsoever. They have great customer service.