Sound Quality: Extremely mediocre. The bass is extremely weak, I used a FiiO E3 to boost the bass, and its still weaker than all my normal headphones. However, the mids and high's are tolerably good, which is saying quite a lot considering these are $8 Best Buy's/Target/name a convenience store stock headphones.
vs Ksc 75 and PX100: I did side by side comparisons of both of these and the Gumy's. To be fair, I amp'd the Gumy's and didn't amp the ksc 75's. These two still blow the Gumy's away, absolutely no contest.
However, the Gumy's are significantly better than the Apple IBuds. I find the IBuds to be completely intolerable, while the Gumy's sound is listenable. If we were to compare headphones to liquor, IBuds would be like Popov; utterly undrinkable any way you look at it, while the Gumy's would be like Smirnoff. Still doesn't taste very good, but its smooth enough so that you don't really notice it's mediocrity.
Price: I bought these for 8 dollars. Dirt cheap, will not care if I lose them. Definitely one of their pro's. Plus, you can find these everywhere, and if you need a pair of buds on the fly these are not half bad.
Comfort: This is by far, THE greatest feature of the Gumy's. I'm completely obsessive-compulsive over comfort, and these are the most comfortable things I've ever worn. I can't stand either the px100, ksc 75, or any other earbuds for over 30 minutes. Infact, before I bought these I have never found a comfortable pair of headphones. These are much more comfortable than the HA-F130's, which are slightly oversized. I guess after making several generations of these things JVC finally found a winning shape.
Aesthetics: I personally find all the colors except for black to be cheap looking (yes they're cheap but we don't need to advertise that to everyone). They're low-key, and look like a quality product.
px100: 6/10 (uncomfortable)
ksc75: 5/10 (even more uncomfortable, clips take forever to adjust)
Gumy's: 5/10 (sound quality sucks, but comfort+price pulls it's score up)
Overall, this is a very mediocre product SQ-wise, but the fact that it's better than IBuds in every way thinkable(especially comfortwise), justifies it's existence.
I doubt very many people will care about this, but I think it'll make a nice reference for the search function.