Well personally I'm planning on buying the pdf later this week because I'm not 100% sure about the product. I'd rather shell out $28 than £25 (+ postage) for a product that I may or may not like.
Now I have been extremely impressed by the rest of the Conan line and I know that Vincent has done an excellent job of capturing the essence of the stories but given how little has been written about Shadazir in the past this is in effect a Mongoose pastiche so I really want to "try before I buy". If I like what I see then there's a good chance that I'll be buying the boxed set. If I don't, well at least I'll have only spent half as much as I would have otherwise.