Interesting service by SingTel. These days almost everyone is using an iPhone, Android or Blackberry and all the phones are connected to data services. Not forgetting those 3G USB dongles are connected to the same data network as well. If you paid only for mobile broadband, you are also sharing the same bandwidth with those who paid for mobile plans that comes with data services. But with Priority Pass, mobile broadband users get higher priority (in terms of speed & bandwidth) than mobile plan data services users.
Also, we can expect commercial LTE services from SingTel by the end of the year.