Pros: Cheapest IEM I've seen with a removable cable, great bass and vocals; full, dynamic sound. Ultra durable, excellent isolation. Option for mic cable.
Cons: Treble lacks extension, fit not for everyone due to bulky connectors and so-so memory wire (not a problem with mic cable)
I will report back for a more in-depth review of the sound, but for now suffice to say that I love the SE215 and it is my go-to beater IEM when I'm not willing to risk my UM3X. It does bass and vocals exceptionally well, which are my two biggest desires from any headphone. Durability is unparalleled, especially for the price. I take these everywhere: workouts, running, beach, etc. and never feel like I have to worry for even a moment about anything going wrong. They are isolation monsters, too; they made great commuting companions when I took the train and bus to work. They are usually my first recommendation to non-audiophiles who are sick of crappy Skullcandies giving out after a month or two of regular use, unless the person in question has small ears and/or is after a cleaner sound.
Overall these have my full support; if you don't have small ears, and want an IEM with great bass and awesome isolation that is built like a tank, you can't go wrong here.