Just signed up for it. I am hopeful, with them being a high profile energy provider, that they build some momentum with this to get most of the networks on board so that we can use it as a consistent method of being charged, with a reliable method of initiating a charge. Even though there will be some networks that force you to use an app, at least with those that use RFID, it could mean that you can confidently just use one card.
No discount as far as I'm aware but no additional cost either. Think the way they hope to make money is they supply a good portion of the energy to these partners and I've spoken directly with octopus who also supply 70% of energy to others who will be likely to join the club soon
Hubsta (assorted local authority chargers)
Plug n Go (seem to be 22kW mostly local to Ipswich/ Norwich)
Added to the existing networks: Osprey (formerly Engenie), Char.gy and Franklin Energy.
They're definitely starting to fill in on those little local networks that you might end up only using once, which is where being able to use an existing card is a godsend. If only I could remember which networks it works on!