Unlike the other EAP225 models, which have a Gigabit uplink port, the EAP225-Wall only has a Fast Ethernet uplink port. This is something of a bottleneck as both wireless bands can easily flood that 100 Mbps separately, leave alone together. Include the three Fast Ethernet Downlink Ports and congestion is guaranteed. That Uplink Port should have been a Gigabit Port like in the other EAP225 products.
NB: I do have the EAP225-Wall as it is the right physical size for the only practical installation place, most of the rest of the internal network is at Gigabit and the internet connection is also a nice margin above 100 MBps.