I just received these today and am so impressed by them that I didn't wait for the burn-in period before posting this review. I first came across KZ and CCA while searching for a new set of IEMs. I was shocked to find this company offering removable cable IEMs with multiple drivers at the prices offered. My previous name brand IEMs include SHURE, Etymotic, Philips, Sony, Hifiman, Rock-It, 1More, UE, Monoprice, Koss, Vmoda, Skull Candy, and Creative. Sony was my first pair when IEMs were introduced at the consumer level way back in the early 90s with a single dynamic driver. I quickly moved onto multiple driver solutions by SHURE, Etymotic, and UE. But neither of these solutions were all that satisfying. The sounded better than earbuds but I always found myself migrating to proper around ear cans. The SHUREs cost more than all my other pairs over the years put together. SHUREs were upwards of $400. The Etymotics were around $100, and the UE were around $200.Here we have KZ and CCA offering multiple drivers at a cut rate price. I was familiar with where they come from in the form of DUNU or Piston IEMs, but never bought any of those - instead getting the HIFIMAN RE400, 1More Triple Driver, and Rock-It IEMs - which each all cost more than either the C12 or the ED16. With regards to the prices on these CCA and KZ IEMs - all a part of Linsoul, I had to take the plunge and my first pair was the CCA C12. I'm going mostly by memory as my SHURE, UE, and Etymotic are long gone. Either lost forever or packed away in the corner of some box that I will never unpack and someone will discover after I'm gone - or mostly likely just throw the whole box away. By memory, the C12 sounded better than the long gone brands and also than my current pairs. I ordered the C12 because it had the most drivers in it and the price wasn't that high. There was a significant jump in price to the 8 drivers per ear or 16 drivers total. But after experiencing the ED16, I realize that more drivers is not better.I saw the ED16 for under $30. At first I hesitated because it only has 3 drivers per ear as opposed to the 6 in the C12. However, there were some glowing reviews from multiple differing sources as well as a few dissenting ones. For under $30, why not. Plus Amazon has a stellar return policy. Incidentally, these offerings as well as many others can be bought directly from Linsoul or other Chinese sites for less than Amazon, but Amazon gets me these in less than 3-days due to the Prime status. I'm basically paying 30% or more to get them in 1-3 days rather than waiting over a moth from China. I think a premium of 30% of $20 is well worth the convenience - plus I know Amazon will take care of me if there is a problem. The Chinese sites offer more models than Amazon and I might have to resort to buying from China if Amazon doesn't get these other models. For the prices of these IEMs, there's no reason not to buy more and try. I broke my $200 Rockit IEMs in less than 3 months and that was very disheartening, but at the prices of these Linsoul offerings, a broken or lost driver is not so heartbreaking - as long as they stay at these prices, which in the back of mind, I don't think is a sustainable business model.Finally, directly onto the ED16. These are smaller than the CCA12, they fit my ears more comfortably. Occasionally the large sized CC12 and orientation of the would irritate my ears, the ED16 do not. Upon plugging in the ED16, I find the bass deeper, overall clarity is enhanced - including things such as vocals, snare hits, and cymbals. Overall, it's a more dynamic and unveiled presentation than the CCA C12. The deep bass on the ED16 might even be a bit exaggerated, but it's certainly not a bass cannon such as Beats or Skullcandy offerings. It just sounds better to me than the C12 - and up until I got the C12, I thought C12 was the best - besting all the other name brands and models I had tried.This could all be a preference of sound signature, but I prefer the more affordable ED16 to the more expensive and more drivers of the C12. Right now, I perceive a little bit of edginess and sibilance in the snares and cymbals of the ED16, but this could go away during burn-in - or perhaps this is the way its supposed to sound in the original recording. I'll have to pull out my ATX-m70s to be sure, but that's for another time. I am the kind of person to update my reviews as time progresses, even though Amazon is often not timely at pushing those updated reviews, and sometimes never.Pleasantly surprised by the less expensive ED16 offering so much for less money and less drivers. I just now switched from the stock tips to Comply, and it seemed to clean things up a bit. I have a pair of Revonext QT5 that I ordered at the same time as the ED16. Most likely will post a review about them but I don't expect to be as shocked by the performance as the ED16 already stole that fire. The ED16 and QT5 together cost less than the CCA C12 and already one pair sounds better than the more expensive model. YMMV as a lot of it has to do with sound signature preference.