The prism system is completely different in the SLC and the EL. Both great, but different. As was said before, the difference in price doesn't have anything to do with weight. For practical purposes they are about the same. What is different is the image and the ergonomics. You'd have to look through both to see if you prefer one to the other. I'm a fan of the swarovision EL. If you can't tell the difference, and you like the SLC ergos, go with those.
