Its basically the $50 robot with a robot vacuum chassis
It uses the same microcontroller . . .
One nice thing I like about it is that it handles encoders for you. Encoders are pretty hard to get right, so it was nice that I didnt have to worry too much about them . . . It also has a built in programmer so you dont need to buy one of those. But the encoders mechanically were badly designed. They geared the encoders up to give a much higher resolution, but used a stretchable rubber belt which caused errors during acceleration/deceleration . . . I hope as I get better at robot mapping that I could rely less on the encoders . . .
If you really like mapping, you can just put encoders on the $50 robot and use almost exactly the same code I wrote for the Create. But you'd need to write encoder code . . .http://www.nubotics.com/products/ww01/index.html
Usually when I grumble about a product, it is because of lack of good customer support/documentation, or a product with obvious flaws . . .
On a scale of 1 to 5 (5 is best), I'd give the Create a 3.5