The Zyxel looks pretty slick actually, it would be ideal for somebody who doesn't want to bother with keeping a PC running or configuring a captive portal. This is just the ticket for all the coffeehouses and cafes that want to get into the wireless thing, but are turned off by all the tech skills required.
Of course you could do all of this (and have more customization options) with a dedicated workstation and AP for less money, but the learning curve is steeper. With the Zyxel, all you need to do is remember the password (admin) and never change it
And the little printer is nice so you can still have hard copies for the accountant after somebody hacks into the thing and destroys everything else.