I work over at the Sportsmans Warehouse in the optics dept. and have played with both the EL's and the
SLC's quite a bit. I get asked this question quite a bit as far as wich one to go with. I look at it this way, you already have the 15's and weight is a factor, and you have the money, go with the EL's. If you dont mind the weight then there really isnt a huge optical difference between the two however the EL is far more erognomical than the slc, yet the tripod adapter is a joke for the EL's. If you dont have the 15's or something comporable you can get the 10x42 slc's and the doubler for less then the price of the EL's. So it really all depends on what you want to spend and what you already have. And there is a lot to be said about the 10x32 EL's as well as the 8x30 SLC's. But again, it all depends and what you want to spend and what is most practical.