this service is ok only if you need hits on website. But if you wanted real ppl with some interest in your service or product , you need some ads ..
That depends actually on the type of services you provide on your website, and also many other factors.
Using this service might be a really good idea, in case when you need to attract people to your website without big costs.
Buying an advertisement somewhere would be something rather expensive, if you really want to make people come to your place, but using this website to make up traffic on your project might turn out as a wise idea, because people may see that you have many hits every month, so it is worth to visit this part of the web.
Obviously, your website cannot rely on something like that, you always need true traffic on your website, and real humans using your website. You cannot achieve anything, only with website hits that has been bought.