Dryer balls, myth or miracle?

From the sound of the product description, these space age-looking rubber dryer balls might be one of the most revolutionary household inventions ever: "Dryer Magic Dryer Fluff Balls dryer balls soften fabrics naturally without the need for fabric softener, reduces drying time, is non toxic and allergy free, reduces lint and need for ironing and saves you time by drying your clothes faster!"

Woah! That's a lot of awesomeness, especially for $4.99. My curiosity is definitely piqued, though I haven't tried them yet, have you?

Part of me wonders if they're a little too good to be true. On one hand, I can see how they'd speed up the drying process: as they bounce around in your dryer, they lift your clothes, which lets hot air circulate better, and stuff gets dry faster. Makes sense, right? But as for reducing lint and wrinkles, I'm skeptical. So I defer to the rest of you out there who already took the plunge to enlighten us: do they work or don't they?