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We have one at my office for evaluation. Pretty good but not perfect, would be fair. It’s quite accurate most of the time, but requires a steady hand. It can also get a little tiring holding your hand in the air. I’d say as more applications become available that are specifically designed to work with the Leap, it will be more useful. As it is now, it is still pretty neat. Not a must have, but I’d still say that it’s worth having one.
My children have used Leaps and said they were easy to use and a lot of fun. Reviews generally have been positive -- here's one and another - but some note that not all apps work equally well and that Leap, at least for now, is much more about entertainment than productivity.