Has anyone used ISO pure low carb shakes as an alternative for IP shakes? One scoop has 110 calories, 25 grams protein and 1.5 carbs...I was going to try to use 2 of these a day and just buy one restricted from IP...I asked my coach and she told me that they are two different animals and I could not use it...I dont see why though...

They're two different animals because if you do that she will go from collecting $87/week to only $29

PS. No, I have not used that. The calories are in range but a little too much protein compared to IP shakes (25 vs. 18 on average)

They also have very different amounts of protein.
Excess protein would put you on a high protein diet instead if moderate, like IP

There is a whole thread of alternative ideas that fit the IP protocol but don't break the bank