I'm on the 1000 plan, 2 weeks. I lost 6lbs last week and I think I've lost about 2/3lbs this week, but that's with totm and a meal or two which weren't really very good, not reeeeally bad, but not totally within the 1000 plan!
My CDC said that if you stick to the 1000 you should lose 3-4lbs a week. So that's about a stone a month.