This is not a super powerful router with speeds rated at 10/100 but it will be more than adequate to provide content to tablets, smart phones, iPhones, iPads etc. Given the small footprint I imagine this device would easily become overloaded with a few devices or a powerful computer so do not go overboard. Never the less the idea is a novel one and deserves some attention.
Cleverly TP-Link made the device such that it can be powered using either an external power adaptor or using a USB power connection. I have yet to try this but I imagine this would mean I could plug the router into my iPhone charger and simply replace the Apple cable with a standard USB cable. This would mean I would not need to carry a heavy power brick simply the router and a USB cable.
As a computer repairer the device will also come in handy when troubleshooting problems with wireless connections. I can simply plug this into an existing modem and determine if the problem is with the modem of with the wireless gateway.
These routers have a retail price of $50 but I have already seen them as low as $19.95 in Sydney.