We used Stone Edge last winter for our driveway (no walkway), and they were consistently prompt and frequent. It probably helped that most of the homes on our street in Riverside South also used them.
Nothing but good things to say. Will use again next year. Price was reasonable given it was no additional charge for the three car driveway vs the standard two car.
I don't remember the exact cost, but it was around $300 for the whole winter, I believe.