Well Joel Hetrick, and a host of other MX, XC, and desert racers use them. So unless Elka is passing them out like candy for free, i'd bet it's a great shock choice. I know they're the unofficial shock choice of Roll Design.
If you do go with Elka stage 5's I'd hit up Jedediah Bunch from Roll Design. He knows quite a bit about them.
I've only run HLS and PEP so i'm not directly familiar with them