Out of the three brands of shake-powders I've tried, Queal definitely offers the tastiest ones, and the most variety as well. Plenny Shake was doable but not as enjoyable as Joylent used to be, Powder Matter was really, really disgusting to me.
I really like the creamy taste of the non-vegan normal Queal shakes, and especially the sweet taste of the apple pie (more like apple cinnamon) and chocolate hazelnut flavors. I still have a lot of flavors to try though.
There was a problem with one of the bags I ordered, customer service was quick, friendly and helpful in resolving the issue. Substracting half a star because of that issue, and because the Queal shaker bottle isn't as good as the Plenny Shake shaker (fortunately I have both now). But from now on, I'll only be buying more Queal!