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sbbohr
I never got on with the 2-speed derailleur part of the 6-speed Brompton. After a month or two of commuting the changer would become unreliable. It seemed like the spring was too weak and the pusher pivot became clogged up easily. Two separate trips to the Brompton dealer, only improved things temporarily. Mine was from the first implementation (with the SRAM hub gear) so perhaps things have improved, but I regularly read of others who also had problems with reliability of the two-speed mechanism.
In the end, I converted it to an SA 3-speed set up which has been trouble free. From the empirical tests I've read, the 3-speed hub gears are also the most efficient of the internally geared hubs. I just wish they would make the highest gear the direct drive. I can't comment of the Affine as I have not tried one.