Absolutely love this for my snare, definitely prefer it to moongels or tape. It provides the perfect amount of dampening of overtones without muffling the snare too much. Gives you a great clean sound, really easy to mic or record, as well as a less ringy noise in smaller venues. It's also great as a quick fix for terrible-sounding rehearsal space snares.
Apart from the change in sound, you don't notice it's there at all. I've had some problems with moongel flopping around or coming loose, but this ring just sits flat on your head and stays there. I also prefer the clean look of a transparent ring.
I have the set, 10 12 14, and 13 inch snare. These rings really bring out the mid range and lower frequencies of any drum, by removing the high frequencies, but still retaining good resonance. You do have to use care, because they are thin. Thomson has a good price on these, so replacement is not a problem. I have been gigging for three months with mine, no problems.
I use this on my snare to get a muffled, but not too muffled sound that still has high frequencies. Sits flat and doesn't rattle against the rim. With this price it's a no-brainer. Easy and very fast to use. There is a sicnificant difference between 1", 1,5" and 2" versions, and I have them all. If they break some day I will order new ones.