Or you could buy a raspberry Pi (though for some reason it gets lower hashrate with my BFL Single than even the 233MHz PC), or just use a PC you have for free.

The TP-Link uses unknown quality flash memory as its main storage - hat could fail due to writing (let's say I want to do monitoring or whatever or it just is writing logs) and there also would be a problem if the router failed to boot (let's say the file system got corrupted due to power failure). OTOH, the raspberry can be use with high quality memory and you can connect a keyboard/TV to it to access the console if you can't get to it over the network for any reason. An actual PC is even better as it uses a hard drive (or a high quality SSD) that would be more reliable than the flash memory inside a router. You can also get a PC very cheap or even free and maybe even downclock it to save power.

This is my opinion and the reason I use a PC for control. Then again - I have a Single and 3x HEX16B with total power consumption of about 500W, the 50W or so the PC uses is not much compared to the miners. If I had a single HEX16B (and no Single), I would probably just connect it to one of my other servers or use a Pi or even the router.