Yes, I started it and then dumped it. Too much, too long, too difficult to use keyboard the way prescribed( unless you've got three hands), AND it gave me an immediate pounding headache. I have done this type of thing before, for a migraine study. That one was arranged to be easy and it still gave me a headache. So be aware! If you're prone to such headaches, you might want to think twice......it's underpaid, too, if that counts.. If you just have to have that 6.00 bucks, do both those ATLAS Labs they trying so hard to sell today. They are simple--especially if you've done their HITs before. Not nearly as confusing as they seem on the surface.....and they won't cause an aneurysm.........and there appears to be pizza sauce on my keyboard.