i just finally managed to find the spec for the er-12. It has a quad core CPU same as the older products clocked at 1Ghz but still with 1GB of ram. Basically this router is exactly 2x the speed of the ERPRO CPU wise as its the same CPU, same clocks but 4 cores, and sadly only 1GB of ram. So for QoS this will do 400Mb/s which is not bad for software processing and that you have 4 MIPS cores for an embedded linux server if you ever need that feature. You can install and run htop on this along with squid cache. each core can do 80Mb/s of squid.
Cheaper than the ERPRO with SFP, half the power consumption and silent, and a decent CPU (still not as fast as mikrotik), why cant you have been like this before Ubiquiti? Also has POE :O .