Ok, I did an ingredient-to-ingredient comparison for the sake of information as it doesn't seem to be out there. This stuff is not missing anything compared to Ensure (you might've accidentally tried to compare it to Ensure Plus). In fact, it contains more vitamins and minerals while having 10g fewer carbs (6g less sugar) and has 3g of fiber (Ensure has none). Here's the breakdown of gains/losses of the Kirkland shakes vs Ensure:

-10g Carbohydrates, +3g dietary fiber, -6g sugar, +15% vitamin d, +25% copper (Ensure has 0%), +8% cholride

Hope this helps people make their decision.