Illamasqua says "Boost" is "blueberry violet", but that does not adequately describe this gloss. It is the counterpart of Illamasqua Lipstick in Underground, a blue-purple / magenta / fuchsia with a blue and lavender duochrome sheen. Wow!
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Illamaqua lipglosses have a fruity scent, which surprised me - the lipsticks have a hint of vanilla - but thankfully no flavor. They are VERY glossy and shiny, but not sticky like some other popular mid-range glosses (i'm thinking of MAC). Instead they are a bit slick.
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The Intense glosses are not entirely opaque, but the colors are indeed intense and the coverage good. Like most glosses, they only wear a few hours. The long square tube has a brush for application. The brushes work fine, but one of the glosses i ordered had some splayed-out bristles.
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As Illamasqua lipsticks are a bit dry, this gloss makes a great partner for Illamasqua Underworld Lipstick, adding moisture and glossing up the rather matte lipstick.
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I don't have a camera to post pictures, but Christine of Temptalia has excellent photos that make the most of the iridescence:
http://www.temptalia.com/illamasqua-boost-intense-lipgloss-review-photos-swatches
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If you like hot pink, fuchsia, magenta or purple glosses and are not afraid of Boost's blue / lavender duochrome, you'll probably like this. And if you like glosses that lean blue, as i do, you probably will, as well.