I think the Big O ring is best used for masturbating because in my experience with this product, while having sex with my wife, it added too much sensation. This kind of ruined my hang time, if you know what I mean.
It's best used on yourself, because when you masturbate, you tend to go a lot longer since you have complete control over the situation. This product could be used for either beginners, or the more advanced, since it's fun for everyone on both sides, as well as yourself in self pleasure. You can have fun with this product because, of course, it enhances your pleasure, but it keeps going, nonstop. Even while you take a break it can still pleasure you. Its a reasonable price, so it's not like you would be losing a lot of money if you didn't like it.

It is made of TPR Silicone, and feels really light on the area. It can stretch to a decent size. I have a decent sized penis myself and it can stretch to it nicely. The product has a smooth feel to it, so it makes it more pleasurable for the user and for couples. I like the texture, but its gets a little slimy when you try to take it off, since it seems to collect everything on there, so beware when trying to take it off! It is very stimulating and pleasurable, but sometimes too pleasurable.

The design of this product is a little aggravating. It tends to pull hair and pinch you sometimes and can throw you off your flow. Its adjustable to many sizes, so if you are concerned about that, fear not. It's pretty easy to put on and take off, but as mentioned before, it just tends to pull your hair. Once you have it on it's good to go. You can even walk around with it on with no problem at all, so when you are ready for the moment, it's already on and ready to blast away. It really vibrates up into your bone and gives you that sensation that many things can not. I fits a lot of sizes so it will definitely fit the average person.