Sorry for the late reply. I had a few crazy days and 0 energy for writing something.
Monday, I received the Soli P, nice and drop proof box. I listen to them every day. I have around 11-12h on them.
I use my Xduoo XD05 Pro - ESS DAC and Sparkos ss3602 opamps. I don't have, at this moment, a desktop rig. The topping stack is for sale at a friend.
First impressions, out of the box, balanced cable (XLR with 4.4 mm dd-hifi adapter). I put them on my head, and the metal parts above the ear cups are a bit uncomfortable. My ears touched the lower part of the pads, and I opened them a notch. Surprise the metal part above the ear cups, doesn’t touch my head anymore. And my ears are in the middle of the cups.
The headband is OK, maybe if it was a bit wider, but is nothing to complain to much. Surprisingly, the ears cups are more comfortable for me than Meze Elite ears cups. I always had a problem with comfort on my right ear (on any headphones). I don't know why, but no matter how I positioned the headphones, some part of the pad always touched my ear. Here, the problem is quite minimal to non exiting.
Ok, Ok, sound stuff.
I didn’t have the mood for much audiophile stuff, but I listened mostly to metal and EDM.
The first thing that hit me was the bass and sub bass. This headphone goes deep and strong. I like Chelsea Wolfe lately. For example, tunnel light and unseen world. On tunnel light, the bass is more mid bass, very fast, and present. You hear and feel every frequency.
Unseen work is a bit special it has mostly sub bass, I don't think I heard and feel so present sub bass on any headphones.
I like how Soli P readers vocal music. For example, Sonya Yoncheva rebirth is one of my favorite albums. I listen to this album on every headphones, iems that I owned. On Soli P, I didn't have that high pitch that scratched my ears. But the level of detail in the voice of the realism is so awesome.
The imaging is the best that I heard on headphones so far.
The cherry on the cake is the purity of the sound. Everything is so clear, clean, without any trace of distortion. It was quite shocking. I waited, and I'm still waiting for some distortion, but nothing. I know it is a good thing, but I need time to adjust myself

.
About power requirements, it requires more than elite. I am at 38-43 with the elite on xduoo on medium gain. With the Soli P, I am at 55-60, maybe more depending on recording on medium gain.
This is so far as first impressions, I will update as I go and solidify an opinion. I am curious how it will be after burn in. On Meze Elite, the change was substantial for transparency and soundstage.
@Ciggavelli, we listen to similar music. Do you have some recommendations for me?