I picked up a bunch of this stuff last year, when Lowes was clearancing it. Yes, it really works, and it's organic. I used it last year, and it made a difference, though I don't know if it made a "50%" difference, as advertised on the label.
I sprayed it in the garden and yard on Sunday, and noticed an immediate improvement in late-afternoon wilt on my cucumber plants and what little St Augustine is in my front yard. It's pricey (it retails for around $25, though I think I paid less than $10), but a quart is enough to treat twice all my beds and the in my yard. And I only spray it once a year, in spring.