please do you buy the QuickCam 4000 Pro if you are doing software development, because their SDK would not work for 4000, only 3000, for other purpose I would still recommand 3000 over 4000, it is $20 cheaper. I bought the 4000 first, then I bought the 3000 for SDK support, they both use the same CCD sensor and exactly the same spec, all I can say is that they are identical, the 1.3 Megapixel image is bad, it is actually a extrapolation from the 640x480 image, it is like you zoom in using a MS Photoeditor, horrible at megapixel, for video, both are very smooth at 30fps