OPTI
I absolutely LOVED my opti!!
I always used it in my bullet w ice, it crushed it up and made it very much like a milkshake! I would often add pure cocoa and a scoop of decaf instant coffee to the chocolate ones, to get my chocolate/coffee fix in for the day. The vanilla tasted like milk to me, i added a couple packs of sweetener a few times, but near the end i liked it as it was.....with the crushed ice of course. I never tried it with whole ice in a shaker or even hot (or w less water to make it like pudding) I just fell in love w the shakes. I wish I could still have them, but they do require quite a bit of extra water as they do kinda solidify in your bowels.
Good luck......and stay positive!