I tried one of these services once about 5 years ago, I didn’t have Adwords on the page, it was for a product I was selling personally and the traffic didn’t bring in one sale.

I agree with dmarzean and Trevas, I just assume now when I see these it’s going to be some kind of bogus traffic.

If you decide to buy it and give it a test let us know how it goes, but I would venture to guess you can spend your resources more efficiently somewhere else.