Currently, I have an Airport Extreme (AExt) 2nd generation and an Airport Express (AExp) 1st generation. The latter as a bridge, extending the network. I'm going to upgrade the AExt for increased performance for my new 2012 MacBook Air. My questions: 1) Does the use of my current AExt and AExp (as bridges for extension of the new AExt's network) have a negative impact on network performance, so I'm better off ditching my old hardware? 2) Will it have a negative impact on network performance, if I use my existing AExp for AirPlay wirelessly, so I'm better off upgrading my AExp as well? Thanks in advance.