I use it every time, but more for the convenience of just waiting for the text while I go about my arrival-day fun stuff. I just love getting that notification!
I don't have a lot of requests to make, though, and it doesn't matter to me if they're honored or not. That said, the range of choices seems a little narrow even to me. So if you have requests you feel strongly about, this might not be the best option.
Also, once you make your choices, they are impossible to change online. I wanted to change them one time (due to someone else flip-floppping) and ended up calling ahead.