Let's get the most important part out of the way
POWER REQUIREMENT
Your Chinese USB dongle or dragonfly black isn't going to power this properly. Throw those in the trash, where it belongs, and buy an amp that can actually power something. You want to have an amp that can output at least 100mw@32ohms and has at least 90 SINAD.
There is a huge difference when using these IEM's with an amp that's capable. If you think these sound thin, you either don't know what you're doing or won't buy a 100$ amp because numbers scare you. These IEMs have been a blessing to the audiophile community as it has shown which reviewers have subpar equipment. If you see someone complaining about these about how they sound, you know who to avoid reading now.
SOUND QUALITY
You get that planar bass as you expect. It extends well and is properly flat. Mids are forward, present, and intimate. Highs on these are better than expected as sibilance isn't that much of a concern. These IEMs sound tonally correct and are more acoustically coherent than most multi BA IEMs.
DETAIL, SOUNDSTAGE, & SEPERATION
These are the only complaint that I have about the P1s. For planars, they are not as detailed or wide as others can offer. Don't get it twisted, these are more way detailed than your T2's or BL03's. Fortunately, the separation these offer rival some giants like the SE846.
RECOMMENDATION?
Do I recommend these to the average consumer? No.
For audio enthusiasts who actually have capable amps? Absolutely.