Leica is a premiere legendary lens manufacturer. Many photography collectors have dreamed of owning a Leica. Its rangefinder camera system was one of the first practical compact 35mm camera for landscape photography in those old days of medium and large format cameras. Leica products are very high quality, known for its precise engineering.
However there are several things you should know about Leica cameras. You have to manual focus. The camera is not really for action photography. It has a CCD full frame sensor (not CMOS). It is pretty slow, only 2fps up to 10 shots. Its ISO only goes up to 2500. It partners with Panasonic which does a lot of engineering for its digital cameras. If you just look at the camera specs, then you will wonder why you will want to fork out several thousand dollars for a camera that any other entry level camera from other manufacturers can beat out.
Well, the reason to buy a Leica M8 or M9 camera is because you already own Leica lenses or want to buy Leica lenses. Buying Leica is essentially buying its lenses. It has the world's fastest lens 50mm f/0.95. With a lens this fast, you won't need a high ISO, and you cannot use autofocus because the depth of field is so shallow. You need to manual focus on many of these very bright lenses. By the way, you will have a hard time to find any Leica lens under $1000, many are above $3000. The f/0.95 lens is over $10,000. Comparatively, for Leica lens owners, the Leica camera body price is reasonable.