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Comments about Sigma Sigma SD-15 Digital SLR Camera Body, 14 Megapixel, Foveon X3 Direct Image Sensor:
The main complaint is that Sigma's specifications tell lies. They say: "The Foveon X3 direct image sensor captures all primary RGB colors at each and every pixel location." And then they claim this is a 14Mpixel camera.
Taking both statements together, it should be capturing 14,000,000 or so RGB pixels. It doesn't. It captures only 4.6Mpixels... each with an R, G, and B sensor. And it's quite fine for a 4.6Mpixel camera... but it's priced comparable to actual 18Mpixel cameras.
The human eye is dramatically more sensitive to luminance than color, so this is the wrong way to do it, even if they were't lying about the resolution. And also, no video, which is unheard of in a camera at this price from any reputable manufacturer.