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This toy is worth the 7 dollars, because you will get something out of it. Though I wouldn't want to have to spend any more than 10 dollars on this massager when I wasn't very happy with the overall outcome.
It is very affordable for a gag gift or if you are on a tight budget. The best thing is that it can be sterilized for your safety.
I would buy as a gag gift for a special friend. It'll get a big smile and a lot of laughs. But for actual sexual play, I would suggest looking for something a little more stimulating and a bit quieter.