Product review (5 stars): Works much better than a hex key or Allen wrench.
I'm a single guy and don't use my disposal very often and so it locks up frequently, due to rust and waste solidifying. I got tired of calling the maintenance man, so I bought the JamBuster Wrenchette. I've used it several times now and it works great! The first time, it was stuck really bad. I had to apply a lot of force and was concerned I would damage something. I kept moving it back and forth until it loosened up and started rotating. Other people said you could use a hex key or Allen wrench but I found that tends to dig into the palm of your hand and turn it purple. The extra length of longer JamBuster Wrenchette seems to give it more leverage and power. It's a good investment.