I've now tried all four flavours of WPC. Here's my thoughts on them (with 250ml full cream milk every time).
French Vanilla
Look & Smell: Looks nice and fine, smells like real vanilla (I think). Pleasant. 5/5
Mixability: Excellent. No issues at all. 5/5
Taste & Texture: Very mellow and smooth. People used to full on artificial sweetening and flavour might find it lacking, but Im fine with it, and used to stevia in general. Great texture. Not my favourite flavour, however. 4/5
Total: 14/15
Rich Chocolate
Look & Smell: Same as above. Very appealing smell. 5/5
Mixability: Same. 5/5
Taste & Texture: Same for texture. I found the taste to be the strongest of all four, and it's awesome. Win. 5/5
Total: 15/15
Iced Chai
Look & Smell: Same for look. Smell is a bit odd, to me. 4/5
Mixability: Same. 5/5
Taste & Texture: Same for texture. Taste is also odd. Too much of something for my tastes (nutmeg?) but I'm no chaiwalla (sp?). Could be legit. Just not for me. 3/5
Total: 12/15
Strawberries & Cream
Look & Smell: Same for look. Smells exactly like its name, and that works for me. 5/5
Mixability: Same. 5/5
Taste & Texture: Same for texture. Taste is almost perfect. Just not as strong as the rich chocolate. 4/5
Total: 14/15
Hopefully that's a fair review. I do appreciate what you guys are doing. Hope the feedback is useful to someone.