Pros: - Great quality (mine came without silicon slices)
- 3 sizes
- Better sound, even in cheap headphones.

Cons: - For me, the 3 sizes is not a great PRO, since the only "usefull" size for me is the Medium...
- Doesn`t fit very well in my ears.
- I think that now its hard to plug the earpices... It`s not just take the headphone and plug in the ear.. with the silicon caps, you need to find a good position to fit in the ear, or it will fall off.

Other Thoughts: My HP headphones are a little big, maybe thats why those silicon caps are firmly fitted into them. I don`t have the problem of taking them off and they falling...
But, now the headphones doen`t fit in my ear anymore... It`s very hard to find a position that they don`t fall off my ear.
It enhance the bass and sound quality, but do not expect to crappy headphones became hi-fi ones. The sound quality is still directly connected to the quality of headphones... If you headphone is "not-so-good", get a better one with the "in-ear" specification.

Bottomline: I wouldn`t buy it again... I would find a in-ear headphone instead of these.

Pros: This is a smart addiction to any phones since the phones fits on the caps.

Cons: Build quality is not good. They have silicon slices on the ends. Very soft and because of this is very to sleeping off the phones.

Other Thoughts: This is a smart invention but the silicon body wold be harder to maintain the silicon caps on the phones.
Does not fit very well in the new iPod phones, only in the old ones (iPod video and back). In my Philips SHE-2650 the caps fits very well, but is not hard to sleeping off because the softness of the caps.

Bottomline: Add some dollars and buy a new pair of earbuds in DX. There are many "in ear" phones that will be better in sound and noise isolation than this silicon caps.

Pros: - cheap.
- easy to put on your earphones.
- 3 different sizes.

Cons: - they are a bit loose after you put them on your earphones (one time when i pulled them out of my ear, they detached from my earphones and stayed in my ear haha).
- unlikely that the large size will fit anyone, so really it's only 2 sizes. one of them should fit though.
- not the best color choice, should probably consider the white ones instead.
- somewhat hard to put on because of the round head on the earphones. normally other in-ear buds are thin and narrow and go straight in your ear. with these ones, the part it wraps around is hard to put in your ear because it's so big.

Other Thoughts:

Bottomline: definitely great price, but comes with some small inconveniences that are hard to explain unless you have them. i would probably stick with buying some real in-ear earphones instead of these add-ons.

Pros: - Very cheap, though I can get them for a similar price on a local store.
- Includes three different sizes to fit your ears (I use the medium ones).
- Quite comfortful if you find the right size.
- Increases bass on my 1st gen iPod earphones.
- Blocks a little outside noise when using them.

Cons: - Build quality could be better, it has slices of plastic on the ends.
- Only fits 1st gen iPod earphones and some other earphones, but not too many of them.

Other Thoughts: If you want to block outside noise and get real bass, better buy SKU 33, those are awesome!

Bottomline: If you have 1st gen iPod earphones, this is a must have!