Used it extensively for almost 5 months with my FiiO M11.

Trebles

• Detailed but not sibilant
• No sharp spikes in the region
• Rock tracks' treble fest won't be a problem most of the time
• Clear and airy trebles add dimension into the stage and imaging

Mids

• Well-bodied and balanced mids
• brings out the beautiful tones of piano tracks
• male and female vocals are both sounding full
• "hidden" mids in rock tracks are unearthed

Bass

• Above average tightness
• quantity is a little on the less side. Bassheads will not like the quantity.
• Sub bass is rumbly and present

Soundstage and imaging

• Wide soundstage for a closed back
• panning of instruments in well recorded orchestral tracks are precise
• sound is in front of you and not inside your head

Build and comfort

• Plastic and metal build feels sturdy and solid
• Pads are oil depots though
• Do not change the pads to velour and any open material as the bass will vanish
• Clamp is just right for my head
• cable is detachable but is not balanced out ready. You'll need to mod the 3 pin connector.

This is my first $100-$200 range IEM so I have no same range comparisons. But I do have BGVP DM7 (around 3x the price). I really love the treble control of this one.

Trebles

• Extends very well with no signs of sibilance but maybe borderline too bright for some
• Trebles tamed a little bit after around 10 hours of burn in.
• String sections in orchestral music sounds alive and energized
• A little airy
• Cymbal sizzle comes out naturally and alive

Mids

• Well-bodied
• Focus on upper mids
• Vocals blend well with the excellent treble (Consonants etc)

Bass

• Very tight and fast
• Low end rumble is good
• No signs of muddiness
• A little bump up the lower mid bass

Soundstage

• Medium width
• Height isn't too tall but not congested

Imaging

• Busy tracks like large orchestral music show no signs of congestion
• Cymbals and other details do not bleed into the background on loud rock tracks

Accessories

• Lots of tips included but none look, feel or sound good
• Cable is a little hit or miss. It feels good but somehow there something off about it. Ended up using the stock cable of my BGVP DM7.
• THE CASE IS GREAT

This is my first IEM above 100 USD.
Used extensively with my FiiO M11 through balanced 2.5mm cable (bought separately)

Trebles

• Mildly tuned but extends well
• Cymbals shimmer realistically
• Great for long listening sessions

Mids

• With ample body and with just the right forwardness. Shines when needed.
  
• Choir parts mixed in rock songs get an extra level of separation from the overdriven parts.

Lows

• Fast attack with decent rumble in the sub bass region
• Will always be just the right amount

Soundstage

• Medium width and height
• Orchestra tracks sound as they should and not too over "staged"

Imaging

• Busy choral/orchestral pieces show their horizontal space more
• Small details in pitch, timbre and even mistakes are easier to hear