100% Whey protein - is that the only kind we can have?

My hubby and I both had WLS.  He had the RNY and I had the Sleeve.  I go on the RNY forum along with the sleeve forum on a regular basis.  Ive read many times on the RNY forum that they need to have 100% Whey Protein because it is what they absorb best. 

Is that true for us who are sleeved as well or can we have any kind of protein?  I ask because Ive been having issues finding a protein shake that I like.  The other day I picked up some GNC Pro Performance Lean Muscle Meal and it was AWESOME!    The only thing is that it isnt 100% Whey Protein.  Will this be ok for my protein shake?  It has 25 grams of protein per drink. 


Here are the first ingredients 

Serving Size 14 fl.oz. Servings Per Container 4 Amount Per Serving   % DV Calories 170.00   Calories from Fat 50.00   Total Fat 6.00 g 9% Saturated Fat 1.00 g 5% Trans Fat 0.00 g   Cholesterol 20.00 mg 7% Sodium 330.00 mg 14% Potassium 310.00 mg 9% Total Carbohydrate 6.00 g 2% Dietary Fiber 3.00 g 12% Sugars 2.00 g   Protein 25.00 g 0% Vitamin A 0.00 25% Vitamin C 0.00 25% Calcium 0.00 50% Iron 0.00 25% Vitamin D 0.00 25% Vitamin E 0.00 25% Vitamin K 0.00 25% Thiamin 0.00 25% Riboflavin 0.00 25% Niacin 0.00 25% Vitamin B-6 0.00 25% Folic Acid 0.00 25% Vitamin B-12 0.00 25% Biotin 0.00 25% Pantothenic Acid 0.00 25% Phosphorus 0.00 60% Iodine 0.00 25% Zinc 0.00 25% Selenium 0.00 25% Copper 0.00 25% Manganese 0.00 25% Chromium 0.00 25% Molybdenum 0.00 25% ** Daily Value (DV) not established † Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs:   Calories: 2000 2500 Total Fat Less than 65 g 80 g Sat. Fat Less than 20 g 25 g Cholesterol Less than 300 mg 300 mg Sodium Less than 2400 mg 2400 mg Total Carbohydrate   300 g 375 g Dietary Fiber   25 g 30 g Calories per gram: Fat 9• Carbohydrate 4•Protein 4

Other Ingredients: Filtered Water, diafiltered skim milk, Proprietary Protein Blend (Milk Protein Concentrate, Whey Protein Concentrate, Calcium Caseinate),

We can have any protein, but whey protein is the most bioavailable.

 I've read several times to skip casein as a protein source.  I understand about having a tough time getting a protein that works for you.  I think you have to just keep trying.  The two I can tolerate are Premier ready to drink chocolate from Costco and Optimum Nutrition 100% whey vanilla ice cream.  I use the vanilla everyday mixed with water and a little diluted orange juice.  The chocolate is once in a while as I can only stand to drink half at a time.

My dietician STRESSES to only drink 100% whey protein ISOLATE and nothing else.