Looking at long-haul for next summer and the basic price is £30 less per person on the way out and £40 on the way back.
The main differences as far as I can see are no hold luggage- this is fine as we'd be restricted on some bits of the trip to minimal luggage anyway and no free seat allocation- which I don't think you get in standard economy anyway.
We might want to pay for seats on the overnight return flight - DS is 14 so could cope anyway - but other than that it seems ok.
Has anyone used it themselves? Oh and I do have reservations about flying with BA but they are the most obvious carriers for our route.