I got the SD1 as soon as the price dropped, and had the SD14 from before that. What is "pretty damn amazing" is that with a flick of the IR filter from its holder/frame in front of the sensor, and addition of a visible-light-blocking filter in front of the lens, you can shoot infrared. And, in about two minutes to reinstall the internal filter, go back to regular shooting. For the infrared, with the visible light blocked, I throw a large black flannel cloth over my head/camera, and compose with the faint image that is then visible. I've been enjoying the smaller Merrills, and am contemplating getting Sigmas' newest lenses for the SD1. I frankly had been feeling that the smaller Merrills outshone their larger sibling with the lenses I already had for the SD1, and wondered if the Art lenses would be an appreciable improvement. --Barbara