These headphones have been with me for a few years now. I bought them mainly as a cheap way to watch movies through our receiver without waking up the kids. Bought them mainly based on reviews from Amazon.
The HD202 is a good example of a basshead headphone. It is also fairly dark, but very easy to follow movie dialog through it, and with many songs very likable. Being a bass heavy can makes explosions and stuff fun. This is definitively not a high-fi can, but for $20 something bucks it probably shouldn't be. TBH, I like this headphone for what it is.
The headphone feels cheaply made. It rest and exerts pressure on the ears. Over time it can be a little painful to wear, so comfort is not one of it's strengths.
There is however one thing that might make these headphones interesting to some. It is relatively straight forward to mod in order to tune it's bass response.
Below are some measurements of the stock headphone, and some FR overlay plots of the modded HD202 (2 different tunings) vs stock.
Please note that I do not consider my measurements authoritative in any way, and I'm fully aware that much more experienced folks such as Marv and Tyll probably will be able to provide more accurate results. The plots provided however do correlate with what I hear. If Marv is interested in measuring them I have no problem sending them his way.
After removing the pads and the driver, the cup reveals a very small hole/vent around the center. Upon closer examination, the center of the cup (where the hole is located) is actually a soft plastic circle glued to the hard plastic cup. Covering the small hole with any material will have the effect of erasing the bass of the HD202 from existence. Partially and carefully covering it tunes the bass.
My preference with this can ended up with having in a little of a bass hump, but somewhat less than what the stock headphone provides. This also has the effect of filling and flattening the mids. I believe it is possible to tune this headphone to almost flat response from around 40Hz to 2kHz.