FWIW, I have both a Raspberry Pi camera (v1.3) and a fairly inexpensive USB webcam, although it still cost twice what the picam did.
Between the two I'd say the picam offers more quality and features for the price, but you 'pay' for that in other ways: You have to make your own mount and case and you have to deal with the ribbon cable, and the basic picams have the lens glued in place, which means it can be a pain to get focused properly.
The mount/case is easy enough since you can print things for it, and you can get cables that are quite long or even use adapters that allow you to use other types of cables instead, but neither are as convenient as unpacking the USB camera and just plugging it in.
Knowing what I know now, I'd spend a bit more on the picam initially (I just got the cheapest one I could originally) to get one that is designed to be focused and has a better lens on it, but I'd still perfer that over a USB webcam of the same price.
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