Product review (5 stars): Great tool.  Technique is also important!!!
Yes, this is just a double-ended 1/4" Allen wrench--but it's tougher than the usual soft metal Allen wrenches you normally find at the hardware store.  I actually stripped a 1/4" wrench trying to free this budge before I found this tool.  My mother-in-law, actually, told me about it.  Thanks Mom!

My disposal was completely solidly jammed.  When powered, there would be the typical sound of a stuck electric motor.  I stripped an Allen wrench trying to free it.  I found out about this tool and tried to use it three times to no avail.  The jam would not budge at all.  I began to fear that my disposal was not jammed but suffered some kind of catastrophic failure.  This was really bad timing, too, because I had just put my condo on the market and I didn't want to have to replace the disposal.

After reading more of the reviews here on Amazon (which, in reality, were as useful as the tool itself) I decided not to give up.  Whatever was wrong with my disposal, it seemed plausible that I could unjam it with this tool based on the very encouraging testimonials.  But I still could not get the wrench to budge at all.  I would try in one direction, then the other.

One issue, also, was that I had to be careful of how much force I could apply to the twisting motion because the torque a applied would also twist the pipes a bit as well as put a lot of force on the kitchen sink, so I was worried about simultaneously fixing the disposal but breaking something else in the process.  I was pushing, sometimes, with all my might and I'm pretty burly, so ripping the disposal right out of its mount was a real possibility, here, so I nearly decided to give up as nothing but frustration was rewarding my efforts.

Finally, I tried "jiggling" the tool.  Instead of using a lot of muscle to try to force the jam, I thought that maybe quickly going back and forth with less pressure might free whatever was stuck in the disposal.  I have no idea what it could have been, maybe a screw or something.  I had recently moved and had about a dozen people at my house to help with the move and any one of them could have dropped a ring, a piece of jewelry, an earring...who knows?  Anyway, the jiggling action did the trick!  I got a little play at first, and then a little more and so on until I could completely turn the wrench. The feedback was grindy and not very smooth, but, after about two more complete revolutions, the wrench was able to turn the motor shaft completely smoothly and effortlessly with no resistance at all.  I got out from under the sink, turned on the water and flipped the switch and my Badger 5 was humming away again like new.

I'm pretty stoked!