Thanks James for giving everyone an opportunity at this contest! Here is my entry.
FX500 - It was the world's first wooden driver IEM with wooden housing. When I first saw these I was quite amazed by the technology and especially intrigued at what type of sound it would produce. Review went one, and while it had great resonance, and timber it was considered very sibilance even after burn in. However, I read changing tips may tone down the treble. Never hearing it before, I am still interested at what type of resonance, sound and timber it produces, even after the production of the FX700.
ATH-CK100 - Triple drivers, who wouldn't want to listen to these. They are the bigger brother of the CK10, depending on review I've read the CK100 have better clarity, detail and treble, but the CK10 have a much more smoother mid grade. Personally, I have never heard anything beyond a dynamic driver or single BA, so multi-drivers are quite foreign for me. I would love the opportunity to audition them (haha, don't we all?)
M5 - Lush, deep, extended bass, that aren't bloated but detailed. I'm not a bass head, or have anything in my gear that could produce the "bass" the M5 have. Though, they're no slouch in treble and mid they're more known for their incredible bass.
PR1/PR2: Tuned for Pop Rock. At one point in time they were considered one of the best bang for the buck around $50 (PR1) and $100 (PR2) depending on the listener needs. PR1 known as being more engaging without the sacrifice of detail in the treble and mids as well bloaty bass. Very balanced from what I can recall. PR2 were probably known for their bass, but they too don't lack in treble and mid. Maybe more comparable to the M5?
All in all they're great headphones for anyone winning them!
Cheers and Good Luck Everyone!