I find having a 120mm pc fan sitting on top blowing down through the case's top holes keeps everything sane. A 120mm fan matches the size almost perfectly, and there are even some usb powered ones available online. Running the fan slow and with rubber standoffs to help air move freely allows it to be nearly silent. Without that, even a single sfp+ to rj45 copper module can overheat and become unstable under load. Other than that the switches work great, perfect option for small scale cheapish 10G networking.
