I love it and I have lost 10 lbs. and have kept it off if I keep using Symlin.
They say you should use it at meals with >30g of carb, but I have used it for 25g meals too with no problems. So sometimes I use it 3x/day, sometimes only once. I wait to inject until I am ready to eat that first bite (in other words, the food is ON the table, and NOT a minute earlier). It works so fast that you can get in trouble if you take it even shortly before eating. Within 3-4 minutes you will feel yourself getting uncomfortably full so I stop eating. After eating I dial in my carbs (let's say 40g), the suggested amount of insulin comes up (let's say 4.0 U), I adjust it down 20% to 3.3 U, do a Dual Wave with 50% now and 50% over 3 hours. Of course, this varies for everyone so you will need to play with it a bit. Try experimenting by eating a McD's hamburger or something where you definitely know the carbs so that you can track it and see what happens. If you go low 2 hours after and then spike, try spreading out the Dual Wave to 4 hours or more.