Well, it is a clone Arduino (which means it could be a faithful reproduction of the Arduino Uno, or the company could have cut some corners). Also, the Arduino designers won't get any revenue from the sale of the board, and some of those revenues are used to fund this site. Sometimes I go for the real deal, sometimes I go for reduced cost via clone. You need to figure out what is appropriate for you.
Note, as listed, the Arduino will only be able to run the blink program, since it includes nothing but the cable to connect the microprocessor to your computer. Particularly for instructional purposes, you should consider getting a kit that includes a basic breadboard, some hook up wires (preferably several different colors), and a lot of the simple components (buttons, leds, resistors, etc.), some simple sensors (light, sound, force, potentiometer, etc.), and some simple output devices (buzzer, servo, motor, etc.). That will give your student plenty of things to do in learning the Arduino.
If you are doing it for a classroom setting with multiple students, you need to make sure you buy the components in bulk, to allow each student to make their own, and to cover things that get lost or broken.
Another thing is China epacket delivery, expect 3-4 weeks of delivery time (sometimes more). I think I've had 2-3 deliveries never show up at all. I got refunded for the purchase price, but it was annoying that the thing got lost, and I lost 2 months waiting for delivery. A lot of time, I prefer going with a slightly higher cost to get shipment from a US seller in under a week (in fact, I'm waiting for the post office to deliver components from Adafruit and Pololu today), than wait for the slow boat from China. I do tend to try and bunch up purchases to cut down on shipping cost.
Sometimes if I need it ASAP, I will pay Radio Shack prices. Radio Shack has recently rediscovered the hobbiest market, and does sell both compnents (usually in the big file cabinets in the back) as well as gear specifically for Arduino. For components, I have a decent electronics store real close that is better than RS prices (but this guy only sells components, he doesn't sell Arduino specific stuff). I also have a bigger one about an hour away that has more selection, and does sell Arduino and clone gear, but not everybody has that option. Often times, in the US, Radio Shack might be the only place near by.
One of the previous times, the question of where to buy from came up, I put together a list of the places I tend to look at, and sometimes buy from: (indirect link to company selling counterfeit boards removed)
Terry King, who posts on this forum from time to time, has some interesting starter kits, complete with his own Arduino clone (or the official Uno for a higher price): Here is his kit for engineering students: http://yourduino.com/sunshop2/index.php?l=product_detail&p=395
, and a somewhat cheaper version: http://yourduino.com/sunshop2/index.php?l=product_detail&p=244