Also had mine today, freight time was excellent.
I had the WPC Rich Chocolate, mixed in 200ml of water. I went halfway thru the recommended amount (150-250ml) just to ensure it would mix up properly but IMO this diluted the taste somewhat and would be better in 150ml if using water or would taste excellent in milk. I'd rate it 8/10 on my experience, like I say, I'm confident it would taste better in less water.
It did also mix up very well, no lumps what so ever, give it a 10 here and again, I'm confident it will mix just as well in less liquid or milk. Will definitely buy some WPI when I'm next due for protein.