The only known problem with the EOS 3 is that some early models exhibit an underexposure metering problem. Some early adopters of the camera sent theirs in for a firmware upgrade, but I heard that Canon fixed the later batch of cameras. But wow, is it a nice camera. It is significantly heavier and bulkier compared to the Elan 7-series or Rebel cameras, but it's built well and takes a beating. Mine has gone through snow and rain, and it keeps on going.
). More importantly, the camera records all kinds of things for each exposure. The software link lets you retrieve that stuff. Kind of like EXIF for digital cameras. Aperture, shutter speed, ISO, active focus point, time taken, etc. For the most part, its completely useless, but it came with the camera and I have a record of exposures if I ever really wanted them.