SO, lets get on to it. The MTPC's are a pair of IEM's that are in a very akward position. It is quite pricy and rejected by the "purist audiophiles" that dislike the brand of Monster, due to the Beats Phenomenon; it is not picked up that well by non-audiophiles due to the muddy SQ a bad amping process can give it. But these are actually a hell of a pair of headphones, and Monster is a company that has earned my respect.
So these were my first "Audiophile" grade headphones. I had been fine with my Beats Tours prior to this purchase, and I never realized on what I was missing out. Once I purchased these, there was no turning back. I was blown away by how good headphones could sound. Now I own the HD600's and the W40's (Update: Now the K3003). I enjoy both greatly, and I am parting with my Turbine Pros because I am selling them to a friend.
Starting by using the IPT, I was not aware of what the MTPC could achieve. True, They weren't THAT BAD without amplifying as some of you say, but they certainly could not compete with the experience that the Fiio X3 offered me.
I used these headphones carefully, and I was very happy that it lasted me a long time. I like the warranty (lifelong) and the free once-in-a-lifetime exchange for a total new one. A TOTAL NEW ONE. Thats how confident they were in their build quality. (or unconfident? lol )
I am not to judge the SQ too heavy here, though I like it. I fee like dancing every-time this headphone is being worn, which can be a bad thing (because some of the music I feel like dancing to is actually soft and sad songs). That being said, this is definitely a fun headphone, with heavy coloring but very good sound quality.
Highs: Highs are fine. They are THERE, but thats it. Its good highs, but not where the strength of the MTPC are at.
Mids: I enjoyed the Mids the most. I feel the MTPC's have really done a good job to bring the sound into your ears.
Bass: GREAT BASS. Nuff said.
Bottom Line: If you want a headphone that is often underlooked and misjudged because of it's brand, and like hipp-pop music with heavy bass and good mids, go for the MTPC. I loved these headphones!