Pros: Durable, Not-Too-Steep V-curve
Cons: Price Hikes, Clamping Force, Not Great For Production
These, thanks to Head-Fi, were my first audiophile-grade cans. After getting more and more into the world of headphones and getting perspective, I can go back and view these without being a first-time fanboy.
I still use the M50s regularly as a portable can with my CMoyBB, and it works great. While not exceptional at the $150 I paid for it, it's still a fun V-shaped sound-sig can that I enjoy keeping around.