The 'proof' that the OP supplied me with is an exact-match domain name ranking for it's keyword...
I recommend that everyone do further investigation into this service before making a purchase.
It's a fast service because it's automated... it's just creating spam profiles on forums and putting your link in.
I don't think it's really a valuable service at all.
It's spam by definition. Forum-owners won't appreciate it. Many, if not all, of the links will have little to no value.