I hope you're talking about teleworker access rather than site-to-site VPN. I just checked your link, and AFAIK M$ still doesn't support permament connections - i.e. the client has to dial the server and the VPN drops when you logout.
I think the main reason PPTP isn't widely used is because it is insecure. Isn't it only an authentication protocol without data or header encryption? (I may be way off base here).
Lastly, you're talking about two Windows PCs trying to keep it together with a Microsoft software-based solution while facing the uncertain conditions of the Internet. The couple of implementations I've seen were not reliable, although you may well have the advantage of a decent telecomms infrastructure.
Having said all that, it should be relatively easy to make it work.