Had pretty good luck not paying for seats in business. Were assigned rows 2 and 3 in the middle on the outbound. On the return they put us in 7 an 8, but I moved one pair to row to 2 and we then managed to swap 7 for 3. I guess that 7 and 8 is ok westbound since you are not sleeping. I was actually going to move us back to 8 but it was gone.......
As mentioned above, only 2 seats were pre-selected on the return.