I like the chocolate and mint flavour. It’s the only one that I actually look forward to drinking… the berry is second best. Even with flavours I struggle with vanilla (the flavour boosts are hard to mix right).
I add a little milk because without it it has a bitter taste. The milk also brings out the flavours better.
Definitely use a blender - I have the blend active which is cheap and works really well.
I use 3 scoops twice a day, giving about half what I need the reset being made up of normal food. I couldn’t imagine having a full 2000 calories worth… that’s a lot of liquid!