Have you looked into why he crashes? Could it be from the 252 (291 if he uses milk) carbs he's taking in from his shakes. One thing you forgot to mention about the Serious Mass is that is has a "WARNING" label on the side of the bag for diabetics. Simple, complex, what ever you want to call them, they are still carbs and for someone that has diabeties or CFRD, 291 of them means trouble. I ordered a 12 lb. bag of Serious Mass and mixed my first shake. My sugars were THROUGH THE ROOF, with insulin coverage. I'm guessing this is why your husband is crashing. And since I know you are worried about cholesterol, you might want to know that scandi's have 0mg and serious mass has 55mg, per serving. My opinion on the taste of the shake is that it is horrible. With the 334g of powder mix needed for one serving, compared to the 85g of mix in a Scandi, the serious mass shake requires 4 times as much powder mix and is 4 times as thick. Scandi shakes a "gimmic?" I don't think so. Yes they have only 5g of protein, but if you add whey, like someone mentioned, that would put you at about 30g, which is plenty for one serving.
This post was not meant to cut anyone down or to be mean. If you think it's working for your husband, great. However, I would look into his CFRD and maybe question why the put a WARNING LABEL FOR DIABETICS on the side of the bag.
In my opinion, this is not the right product for a person with CF to gain weight.
Anyone want to buy 12 lbs. of Strawberry? It's going in the garbage tomorrow.