I'm flying economy on BA478 to Barcelona on Saturday and had reserved 2 seats at the back of the plane (I like to have a view so avoid being over the wings). More seat availability has come up at the front of the plane (rows 6&7) and I'm tempted to book seats A&B or E&F there, but seatguru says the middle seats in the front rows are uncomfortable due to the club europe configuration.

We're not checking in bags so there's an advantage to being at the front (unless it's a back-unloader) at Barcelona. Are seatguru correct in saying the converted middle seats are bad? If so, I'll stay at the back of the plane.