I'd agree. You could burn more Fat bouncing up and down on a Pogo Stick for an hour, which is cheaper, and if your technique was good, you could attempt a little squat move on the way back down, for increased Glute and Leg activation.
Just make sure if the spring is a bit rusty, that you lube it first, then you're good to go
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In all seriousness, it is just a gimmick. A good diet and having a good training programme in the Gym, can make all the difference.
They are proven to work. A lot of these kinds of gimmicky things probably aren't, and would have no solid peer reviewed, independant, scientific analysis to back them up as credible in the long-term.
Whereas a good diet and training regime, has lots and lots of peer reviewed and credible science all over the net.
