Summary: If you're looking for some headphones in the $20 range, you could absolutely do worse than the HD-202. As far as "cheap" headphones go, they have a decent sound and feel reasonably comfortable, just don't expect them to sound like you spent $100.
I tried them in three different contexts, for this review:
FPS gaming was a serious let-down.
Pros: Extremely long cable; Included cable wrapper
Excerpt: The sound quality is not as good as I had hoped for a Sennheiser product. I am using these for audio editing and I don't think they are the right model for that. I have a pair of Panasonic's that were about the same price but the sound quality is much richer.