I haven't been eating this for very long, because it's hard to get past the taste, so I can't comment much on whether or not the weight control part of it lives up to its name. However, I can comment on the taste of this and other oatmeals in Quaker's line of weight control oatmeals. They have a horrible chemically aftertaste because of the artificial sugars used (sucralose and acesulfame potassium).
I think if Quaker wanted to make a more effective product that gears itself towards those trying to lose weight, it should have just lessened the amount of natural sugar and left it at that, no need for the bad tasting artificial stuff. Their regular oatmeals are often too sweet...I usually like to add a packet of plain oatmeal in with my flavored packet.
As for the weight loss part...there seems to be more in these packets than in their regular packets! And there is so much more to weight loss than to remove sugar. In fact, recent studies have shown that artificial sugars actually cause some people to gain weight. Each packet is 160 calories, which isn't very low compared to their other flavors. In fact, on the front, in small letters, is written, "Not a low calorie food". The good thing about it is the 6 grams of fiber in each packet, as well as 7 grams of protein.