Pros: Cheap price.
Cons: Low volume. EDIT: much improved with a Venture Craft amp.
Since nobody else will admit to owning these I'll be the first. I was looking for something dirt cheap that I could use while doing yard work. They are certainly cheap at $19 and will serve their purpose just fine. The sound is actually not too bad considering the price. At first I was disappointed because there isn't a lot of bass and the volume is a lot lower then I'm used to with my HK CL's or the Beats Tour. But for the price they will serve their purpose just fine and as long as they make it one summer of outdoor use I'll consider them a bargain.
EDIT: I have read the advise/comments below and purchased my first amp. An amp for headphones is all new to me. Did not know they existed. I now own a brand new Venture Craft GD-03. We recently retired 2 iPhones 3GS's and one is now permanently attached to the Venture Craft. I spent the last several hours testing out the new amp and without ever having used one and having nothing to compare it to I have to say it makes a huge difference IMO. I have upgraded my opinion on the Koss UR22i's. I can hear a very nice improvement and am actually starting to enjoy them and appreciate their comfort. Thank you for the comments and suggestions and for pointing me in the right direction. Unfortunately I can see a desktop amp in my future.