Pros: Good bass, Decent Isolation, Great Value, Comfortable, Not Fatiguing, Neutral
Cons: Pleather pads (for some), Perhaps too much bass
Two years ago, I purchased my first pair of headphones. SkullCandy Hesh 1's. And. I. Hated. Them. They were incredibly uncomfortable, and the sound to me, wasn't any better than my apple ear buds. So I sold them after a day and did some serious research into the most affordable entry-level cans. I bought these and I was really satisfied. The isolation is good, I know a lot of people really like to listen to music at ear-damaging levels, but I don't, so in a small college dorm I could listen to music and watch movies, and they isolated well enough that my roommate couldn't hear them at all, which is a major plus. A lot of people just getting into headphone listening seem to think that bass is the most important quality, and while I strongly disagree, the bass in these headphones is more than enough to satisfy. One thing I will say about comfort and the pads, they aren't really soft, they are a firm pleather, and some people like them, and others hate them. About the grip: I thought it was fine, and they didn't grip hard at all. I have the HD-650's and they are like an iron vise compared to the gentle pull of the M50's.
For the value, you really can't go wrong, and these are a great introduction into the headphone world!