Probably not that different, as it's the same IT system with a different logo slapped on it. It can go either ones of these ways (out of personal experience):

- Wifi does not work (can buy voucher, but no connection)
- Wifi works, but payments don't work, so only free pass activation
- Wifi works, payment works, but can't move voucher device to device
- Wifi works, doesn't work, works, doesn't work... pretty much the whole flight.
- Wifi network not visible at all during flight. Announced that due to a technical problem it's switched off
- Wifi not installed on the aircraft (this probably doesn't apply on the 777, I'm not 100% sure if every single one of them has been retrofitted with wifi or not)
- Wifi works just fine, no issues to report