It runs the same script as Neobux. That's a good thing, as Neobux is one of the longest running and legit PTCs out there. Onbux is looking top notch though with its better referral click averages. Basically you earn more and pay less referral management costs.
I've made back my investment ($5) and are continuing to earn more. If you have the patience to click the ads daily and to monitor your referrals, Onbux is a great way to get some additional funds into your Paypal or Alertpay accounts.