i spend about £1k per month on FGW and have just bought my first ticket using Raileasy from he Avios eStore. Definitely registered the purchase, and says "pending award".

The fare was exactly the same as walking up to the ticket machine - but they couldnt do a tube card. However, using a contactless card works great ans is the same price as Oyster.

It's 2:1 but i'll keep an eye out for the 8:1 deals too.