My hubby has one...I don't know the brand, but it's just a plain, purple jelly one with nubs inside. He says that its not the same (like you said you would hear) but it does give a much different, but very pleasureable, sensation. He likes it when he can't get a hold to me same as I like my vibrating jelly dong when I can't get to him.

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Kitty's Lingerie
Kitty's 1000th
Surprise Threesome
Lazy Evening
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Once you can accept the universe as Matter expanding into Nothing, that is Something. After that, wearing stripes with plaid is easy. --unknown