During the process, I decided against it. Going to stick to Vodafone.
Primary User get 150GB, while each add-on gets 30GB... The rep was unsure if add-on gets a separate rollover benefit too. (This is true for Vodafone)
My main reason to break-away was post consumption of allotted data, there is a data charge of 2p/MB and this cannot be stopped or disabled.
Add-on users are unable to make calls that will be chargeable. (ex. international calls)
Meanwhile, Vodafone has decided to extend Prime Free for an additional 6 months.
I did not ask them for this, nor I talked to them at all during the porting process.