I'm a bit late to the party...but here are my thoughts:
I was recently in the market for some IEMs, and eventually settled on the Pinnacle P1. I had previously had the M6 Pro which I still use when I go cycling, and I was so damn impressed with the bang for buck value that I simply couldn't help myself but to be intrigued by the P1.
The P1 has some incredibly good reviews, and at the end of the day I'm super glad I got them. I will say this though, they are rather bright, but they are incredibly detailed. Swap out the stock tips for some Sony Hybrids or Spinfits, and the sound is (IMHO) perfect. Seriously, the sound so damn good and there is just so much value crammed into the relatively low price.
I'm the type of person who spends countless hours doing research before I buy pretty much anything....and I NEVER "upgrade" unless I can genuinely see/hear the upgrade as an objective improvement. As such, when I was looking for headphones, I settled on the M40X. Of course, the M50X is more popular, but I crave for a balanced, neutral sound signature, whereas the M50X is widely accepted to have more of a v-shape signature. I eventually stumbled upon Sonic Sense Pro Audio on Youtube. These guys are pretty awesome, and the record the sound coming from headphones so you can hear what they sound like relative to one another, as well as relative to a source track. I genuinely, honestly couldn't tell a damn bit of difference between the recording of the M40X and the source track. That, to me, is sheer accuracy.
So when the time came to get some IEMs, I knew that's the sound signature I wanted. After swapping out the stock tips on the P1 for some Sony Hybrids, the signature was considerably more in line with that of the M40X, and I'm hoping that the Spinfits will provide that extra last little bit of refinement.
Now, to weigh in on your question about whether or not more drivers are better, I'd say absolutely not. I compared the P1 to the Westone UmPro 50 (5 drivers), and was genuinely shocked at how veiled and dark it sounded in comparison to the P1...especially considering the price difference.
To be perfectly frank, the whole idea of multiple drivers is inherently flawed to me. Keep in mind that I'm no sound engineer or anything like that, so I'm totally open to suggestions and corrections, but this is my rationale behind my view:
If you look at the frequency graph of a song, you'll see that it's 1 continuous wave that has many different amplitudes etc. So the reason I feel that multiple drivers systems are flawed is because the whole idea behind them is to split the sound up so that each driver produces a different part of the frequency spectrum. However, you have no guarantee that when those individual waves eventually combine with one another before reaching your ear drums, that the relative amplitudes, the distance between the wave crests and troughs etc. will match that of the original source.
Moreover, look at our eardrums...they kinds look like a dynamic driver diaphragm, right? So, does it not make sense to use a device that mimics the shape and response of the ear drum? I don't know if there is a dynamic driver that can match the response of an ear drum...and I'm pretty certain that no 2 ear drums have exactly the same response, but surely a driver that responds the same as the average ear drum would suffice? So I guess, theoretically (to me anyways) a dynamic driver seems to make more sense. These are just the things I think about late at night when I can;t sleep lol.