Auto-surf sites are usually not good for your computer (if you are unprotected), because the sites rotating in those sites usually contains malwares, viruses, and other things that could damage your computer. And even though there’s nothing we can really consider clean surfing (much more on auto-surfing), I think these two Auto-Surf sites are less risky than others:
http://fivehits.com?ref=9547
http://www.magichighway.com/txauto/?refid=7289
Some other Auto-Surf sites that could deliver good and fast hits to any site you want are the following:
http://autohits.dk/?ref=1099566205
http://www.fastcreeper.com/?ref=2329
If you care about your Alexa rankings, you can consider using Auto-Surf sites to build up your website’s traffic stats. If you want to promote a program though, Auto-Surf sites are definitely useless. Nobody is viewing your programs in these sites. I, myself, am using these sites for the purpose of helping my GDI team members to fulfill the 3in7 requirement for the money-back guarantee. It’s pretty useful to me. I could deliver a thousand hits in just a matter of 2 hours, or even less. 
