Have any of you tried any of the mix your own protein powder companies?

Here's an example:
www.proteinfactory.com/store/

I've never been adventurous enough to try one... especially since I rarely use protein powder, anyway. But I've seen them recommended on other boards.
I'd be curious to hear a review from someone that's used them, and possibly get a recipe recommendation. I'm just afraid I'll order a batch and it'll end up tasting like ass.

-D