I had just moved to the Orlando area, and I did not know anyone here. The program sounded great to me, and I signed up. In the few years that I have had it, I have only used it three times, but I was very grateful each time.
The surprising thing is that I have never used it for my own car. The first time it was for my niece when we were stranded due to a dead battery in her Toyota, the second time it was because my flatmate locked herself out of her truck, and the third time happened just recently. A friend of mine and I were on a road trip to a little town on the Gulf Coast when her car started smoking. Uh oh. After trying to figure out the problem on our own and calling a few more knowledgeable people, we determined we were not going to be able to drive very far, so we used my #HELP service to get a tow truck.
The tow truck came within a half hour, and the guy was really friendly. He even tinkered around with the car a bit and helped us figure out a way to jerry-rig it so we could drive it back to our hotel rather than getting a tow right then. This was great because it gave us some time to research local auto shops rather than leaving the car at a random shop that was already closed by that time of evening.
So all in all, #HELP has been a great service for me. At $2.99 a month, I was very grateful that AT&T kept the program when it absorbed Cingular. I heartily recommend it!