I would not buy traffic from this source. It looks like they are selling you traffic, but I doubt if it will convert into sales. If, it were me I would stick with getting traffic by doing the work of building links, posting content to my blog, and sending out the RSS by using social monkee and other sources.
I feel the advertising dollars could be better spent on other business production methods. The website does not even seem to be designed by a professional in my honest opinion. If , you do want to purchase reputable traffic, I would use the suggestions that Homebizpedia recommended, these seem like better options for at least getting some buyer's seeing the real product or service that your currently promoting.
Yes buying traffic in some instances can help for the Alexa Rankings, but still some old school methods for this step are still very benefical to the overall results!!
I hope my answer helps you better with your question.