That’s an interesting idea for a sex toy, but it seems more like a funny/ novelty item than something you might use often. It would be better if you could see it in person before spending money on it. A lot of adult toy stores will put batteries in an item. You can hold it in your hand (often they’ll have you touch it through a plastic bag) and get an idea of the strength of the vibration. For this toy it’s also important to know what the tongues are made of. If they’re not a very soft material it could be very uncomfortable. And is it just me or does this toy look like a bubble tape dispenser??
There’s actually another vibrator out there that’s sort of the same idea, called the “mini tongue.“http://www.pinkcherry.com/Lady-Calston-Mini-Tongue-Vibe/productinfo/LADY.6900/ It’s super creepy looking and the movement seemed weird, but when I worked at an adult toy store we actually sold a lot of them. I don’t really get it.
It’s risky buying anything that’s brand new on the market, but babeland is one of the best places to get a sex toy if you’re going to shop online. They have another vibrator called the layaspot, which is a pretty good vibrator. You can use the tip for clit stimulation, but it’s also curved so you can hit the g-spot. It has strong vibration and different patterns like pulsation, wave, things like that.