I joined with Optus last August and experienced a slow speed for NBN from the start I called the customer service department and had an extremely helpful team member who increased me to speed 2 free of charge. Since then we experience slow usage quite frequently and I often have to turn the wifi off and use my mobile data on another phone call to Optus the team member was rude and unhelpful and advised if I want the speed promised you need to plug the laptop directly into the modern, I personally think this defeats the purpose of a wifi connection and also is not possiable with a Mac book (which both myself and my house mate have) all in all i am not very happy with Optus and once the contract is up I will definitely consider my options and look at changing companies.