99% of their traffic is bots......If you use it with adsense you will get banned. Seriously if you want to lose $10, just light a bill on fire instead of giving it to these frauders....
Also look at this: http://www.wickedfire.com/traffic-supreme/10755-i-just-flushed-twenty-five-bucks-down-toilet.html
A couple years back I used goClick to promote an affiliate program. The program was a payday loan company. At first, I got enough conversions to make a good profit, so I know there were real people applying and paying the fees. After two weeks, the conversions dropped off to next to nothing, and stayed that way. I dropped goClick soon after. So I can't say if the traffic is mostly bots or not, but there was definitely a very limited pool of real people clicking on my ads. Jay