Had it running on Simplicity on the 12th and PAYG later on.
Works ok on a Web Max Bolt on, on Simplicity. However, the Cloud/BT Openzone isn't there, and you're not getting free Customer Services calls for example.
Got some serious data errors later on, trying to use a PAYG SIM with a Web Max bolt on after a while. You lose much of the usefulness on PAYG to be honest, through issues with data rates.