I tried one during the cleanse phase as well, yuck.
Most of the shakes were just gross to me, either too thick or too thin, and the flavors were ...ugh... especially the Isopure ones, eek! Shakes didn't improve much after surgery. I was able to tolerate the nectar proteins before surgery, however afterwards they were too sweet for me, and still are.
I ended up primarily using unflavored protein powder in the broths and soups instead. Congrats on your DS! I have few friends that had the DS about two years ago, and they are doing amazingly well! I hope the surgery is a complete success for you! Welcome to the group!