Hi Pookster!
As you know by now, us LWL's use whey protein shakes to supplement our protein intake. I looked at the ProCel webpage and see that it's whey also. If you want economy, good taste and easy mix, PRE-OP, I use supplements from VitaminWorld.Com.
http://www.vitaminworld.com/pages/ca...&CID=47&Page=2
The Precision Engineered Whey about 1/2 way down the page. (I see it's on sale so I will order more.) It shakes easy and dissolves in plain water. I like the Natural, with a little vanilla flavoring. (With a 1/4-1/2 cup FF cottage cheese in the blender, it's pretty close to a real ice cream shake. You can use a little Splenda if you need to sweeten it up, but I don't. *Also wanted to add that I can make a double batch in the blender and store it in the frig. Just need to shake it up to reblend the contents before drinking.) I usually have my shake while making dinner, and find I am full enough from it at times to eat less for that last meal of the day. Also, as a filler if I need a meal 6 for the evening munchies. I also use the chocolate for mixing in my oatmeal.
One thing you must be careful about supplements is that they are not regulated by the FDA, so you can only take the word of the manufacturer as to what's in it. I think you should take your Dr.'s advice for POST-OP shakes because it's so important for your healing. But I thought you might find these helpful for your "pre-op practice."
EAS, the Body for Life people make pre-packaged shakes ready to go, but they are a little pricey. I keep a 6 pack on hand for emergencies, like being out and can't eat, but I've only had 2. They don't fill my hole like my own, have 190 calories and only 15g of protein. EAS also makes a powder that I can buy at WalMart in the Pharmacy, but also pricey compared to the above, and chocolate flavor is about the same. While we were travelling this weekend, I saw an EAS truck/trailer on the Interstate, and it was gorgeous. I had to wonder how much that truck and paint job cost? For the price of their products, I can see why they can afford such luxury to transport their goods.
Everybody has their favs, so do some research and experimenting.
2 cents,
dip
! Hope you don't mind that I post here. But gee that meeting sounded so informative, and I bet all those great post-op results are very encouraging for you and your sis! I can't wait for your turn to come up! I'M excited for YOU! 
Thanks 
