I recently purchased P1 from Amazon since i lost the massdrop offer. I also own a Earsonics SM3 and LZ A4, as well as Focal Spirit Pro headphones and a quite decent hifi system. In my opinion, P1s sound the most natural from the IEM bunch. They have a sense of timbre accuracy that i think armature based phones fail to deliver. They 're also the most balanced, although not 100% flat. I hear a small dip in the upper mid's that is followed by a small peak in the "lower" part of the high frequency band. This relative trait gives them that additional airy sense of 3D-ness and instrument seperation. My ears are very sensitive to aggresive highs and initially found that peak a offensive, however switching from double cone tips to comply foam ones solved this issue. Switching back to LZ A4 (which was my main IEM for 4 months prior to P1s), i found their overly dynamic sound almost rude. They do a great job into creating a deceivingly realistic wall of sound aided by their subbass boost, making them the better choice for busy environments where IEMs can sound a bit underwhelming. However the P1 is better overall. Some say that they lack subbass but i found them perfectly true to the source. Overall, the best word i conclude to describe P1s is "honesty". They build on the fundamental IEM strengths, providing clarity and 3D like sound, without trying too hard to present a greater, fuller sound above the abilities of a typical IEM. Some head-fiers may prefer a more superlative way of presentation in which case there are plenty of better headphones even in lower prices. For someone that likes a natural presentation and focuses on the flow music i believe that P1s are one of the best choices in the market, regardless of price.