@ cathleenann,
I guess i was lucky, i had 2 weeks of two shakes one meal before my surgery. I can say that after surgery liquid diet got old too, but look on the bright side the surgery will be done and you will have the tool for a new life.
If you are doing the shakes now, play around with them to find mixes that you like. Remember sugar free chocolate syrup, sugar free pudding/jello (dry mix added to the shake) and extracts do wonderful things to a blan shake.
I personally get the vanilla shakes and change the flavor to what my mood is now. My surgery was September 2013 and i still drink the shakes. I actually like the ones from Bariatricadvantage. And for extra Protein i get unjury to add to the shake (un flavored).
Cindy