If flew it on a B3 model for a summer contract. Found it no so bad with light and slim pax, by the way an interesting reason to ask the loader to place babes on the bench
More seriously, you will need the curved-bar that prevent the pax located in the middle to have access to your stuff evenmore on a BA model, fitted with engine command in the middle (not that pb with the B3). Also remember that max. load on this type of seat is limited to 140kg. (beware of CG's changes).