A lot of them say its Google Adsense safe, but I assure you that there not. Google is not stupid and they know more about this scam then the people who made the software to begin with. People pay Google heap's to advertise to real people, so Google takes this very serious.
I writing this as one of my clients thought it would be a great way to get 1000's of daily visitors to their website, only to find out that there were no conversions, and all the traffic was either coming from China or somewhere else with the same IP address. And if it's not the same IP address they use a proxy to change the IP.
High bounce rates will only give your site a bad name in Googles eyes that it's basically telling them there is nothing interesting on your site.
When I do a search on Fiverr I notice there are tons of great reviews, this is only because the people who purchased these are trusting the sellers to give them real visitors and doesn't know about traffic generating software. But it only takes 1 second to do a Google search (search on Google for "Traffic Generating Software") to find there are endless amounts of software available for anyone to do this themselves. Or furthermore, articles warning users the risks of using them.
Let me and the community know if you've either purchased any of these gigs or had any good or bad experiences.
NOTE: I shouldn't say all are bad, but 99% of them are.