My honest review.
I'm a SIG guy. Way back when my brother got a USP, I couldn't wait to shoot it. A famed HK. I was left totally unimpressed. The grip was alright, better than the Glocks at the time. The trigger was so-so. Mag release was odd to me. It shot just fine, but didn't exude quality like my SIG. Fast forward a decade or so and I picked up a trade-in P7 before they became all the rage. Unique design, odd operation and ergos, mushy trigger. Still I like it because it's different.
The VP9 comes out and it's what I've always wanted for a polymer striker. Changeable panels for my big hands, some finger groove action. Every video I watch it seems to have no muzzle rise. The only thing I didn't like was the mag release. My LGS finally got one in and I handled it. First nice factory trigger I'd experienced in an HK, or any striker for that matter. And I didn't have too much problem getting the mag paddle with my thumb, so I bided my time and got one for a good price on GB. Dry fired the crap out of it and practiced mag changes. Was so excited to finally shoot it, but I couldn't put more than 1 round out of a mags worth inside the 9 ring at 15 yards. No grouping either. I literally circled the black. Shooting at speed, I couldn't even do a proper double tap. I just couldn't reacquire the sights fast enough. It doesn't recoil vertically for me, it wiggles/yaws. I've put in more practice and gotten better with slow fire, but still struggle with faster shooting. The mag paddle also stuck up from the trigger guard and would poke my finger everytime the trigger broke. HK CS took care of me and sent me some replacement parts. It's still not quite flush, but doesn't usually catch my finger anymore.
Recently, I stumbled on a heckuva deal on a PPQ M2 and unexcitedly bought it. Took it out for the first time and shot it the way I was hoping I'd shoot the VP9. It just came so naturally, where I'm still working on my interface with the VP9. I have had some ammo issues with the PPQ (bulged cases on what used to be trusted reloads jamming the slide just out of battery, then hitting a bad batch of underpowered factory ammo causing two stovepipes and one almost squib). Even though I know it's ammo related, I still don't trust the PPQ yet. I still do better with it than the VP9 and is the first time I felt my EDC might not be a SIG forever.
I want to love the VP9, but she's playing hard to get. But then, everything with firearms is subjective. What isn't working for me yet, works like magic for someone else. So do you really need one? Dunno, but I think you really need to try one. Hopefully it's a good match for you.