So you might have heard of SpinLash:

"The mascara, which comes in black or brownish-black, has a rotating brush. It can spin both ways, allowing you to easily apply mascara to your top and bottom lashes.Spinlash claims to "simultaneously separate, organize, shape, coat, lengthen and volumize your lashes." And, if you like the idea but already have a brand you like, the brush can be used with your favorite brand, though Spinlash's mascara is safe for contact lens wearers and not tested on animals."
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Now two giants are also jumping in on the bandwagon:

Lancome Oscillation
"According to a press release from Lancome, the beauty giant’s new Ôscillation mascara features a brush that provides 7,000 vibrations per minute. The point of all the lash-shimmying is to aid application and provide 360-degree coverage for your lashes."
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Estee Lauder TurboLash
"Apparently, there is 'a relationship between vibration, length, volume, separation and curl'." Or so Estee Lauder claims of their new TurboLash All Effects Motion Mascara, which is being hailed as the world’s first battery-operated, vibrating, all-effects mascara. Set to be launched on July 17 exclusively at Saks Fifth Avenue, you need $30 to get your hands on this super mascara brush with vibrations of 125 micro-pulses per second."
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Spinlash is the most affordable at $15.
Would you try any of these mascaras? Gimmicky or great?