How much is it? Small-$200, Medium- $300, Large- $400.
Why did you chose this Tablet? Intuos makes the best quality Tablets for reasonable prices. I never have a problem with the nubs wearing down, the size is wonderful and just overall quality for the price. I've also owned the intuos3 and the Graphire4.
Negatives: Wacom doesn't produce the best chords, buy a PS3 controller chord as backup. The intuos4 was built with poor mini USB ports, both ended up pooping out on me in less than a year and a half. Because of this flaw I would suggest getting an intuos3.
What is a Tablet? A pad and pen you plug into your computer that you use to draw on the computer with. for more information, either click the link above, or google it.