Don't use them if the cashback is the main driver
They declined my cashback and having completed the trip without any amendment. They stated that I amended the booking but haven't been prepared to say what was amended.
I won't be using them in future unless their price is substantially better than anyone else's.
Booking was easy enough and their website was ok but nothing special.
All in all, use them if the cashback isn't the main driver for going with them. I felt let down at the end and the reason provided was a blank term with no substance as to why it was declined.