jlatorre was asking about the 40-540, not the 40-690. They are quite different.
jlatorre, before you buy a saw, try to actually cut wood with it. All saws vibrate a little, but make sure it doesn't vibrate too much. Also try changing blades, it is easier if you don't need a wrench. Most people like blades without the pins at the end, they fit into smaller holes.
There are some comments on the 40-540 on this site - search for 40-540.
Best of luck and let us know what you buy.
Jim