The primer's pretty good: it's thin, and feels moisturizer-like. The tube's pretty small though, and that Monistat chafing gel works just as well, if not better, as far as grabbing foundation goes.
But KA's primer is better to mix with his Sensual Skin Enhancer to make a concealer or foundation. Works better than mixing it with moisturizer, ime. Best application I've found would be apply moisturizer to your face first, then the primer+SSE mix on top.
So... unless you have the money to burn, or want to use the SSE, I'm not sure I'd rec getting it over another primer.