These rings are less than exciting, and definitely not worth $21. The sensation added by any one of the rings is very limited and the hassle to pleasure ratio is much higher on the side of hassle. The clear material eventually becomes discolored and they constantly feel sticky on the outside, even after they have been washed.

As you stretch the ring wider, the area covered by the ring gets much shorter. When stretched wide enough to fit over an average sized penis or penis shaped object, this effect drastically reduces the amount of sensation experienced by the receptive partner. If you're going for gentle penis squeezing sensations, this toy does the trick. But don't expect any other body parts involved to notice anything different.

The best way to use this toy I have found is to utilize each of the 7 rings as part of the whole toy, rather than 7 different toys. Using the rings in conjunction with one another, you can create a sleeve of rings down the whole shaft. Make the creation of this personalized sleeve part of the foreplay, and you can have all sorts of fun. Until, of course, you add the obligatory condom or lubricant.

I found these rings to be generally incompatible with lubricant or condoms. Lubricant makes the rings(surprise, surprise) slippery and they no longer stay in place. If you are trying the custom sleeve idea mentioned above, this then becomes a problem when the rings lower on the shaft slip around and begin to push the rings higher on the shaft up and off the head. If you add a condom, either for protection or to keep the rings in place, you decrease the amount of sensation possible from the rings. Please don't try to put the rings over the condom, as this will dramatically reduce the effectiveness of the condom.

For those brave enough to try out some alternative uses of these rings:
Turn the ring inside out. This gives the wearer more sensation and since the outside is stickier, keeps the ring in place better.
Put the ring on the part of your dildo or vibrator that rubs up against your G-spot. The round knobby ring can add a little extra kick to solo play.
Add a ring or two to any toy you use up against your clitoris. The heightened sensitivity of that area will make the addition of a ring more noticeable.