You can only earn up to 5 minutes a day on it. Most of the ads are actually less than a minute long, and I don't even really watch them most of the time, I just let them run while I'm browsing other sites.

I usually only use my phone one or two minutes per day, so as long as I do sugar momma every few days I can essentially use virgin mobile for free, aside from topping up every 3 months.

I'd say its worth signing up just to check out out. You don't have to give away much private info, and you probably wont have to download any extra software to see the ads, as they just play in your browser using flash.