Elka on 2012
I put an Elka on my 2012 shortly after I bought it. Got it from SVracing.
Put about 15k miles on the combo, all street except for little detours through the occasional ditch, yard and some gravel roads. It was a good upgrade and was very usable on a road bike. Not having any off road experience I can't speak to its usefulness there.
I ended up trading off the 2012 and switched the Elka over to my 2005 DL. Other than a few minor adjustments ( I use slightly shorter dog bones on the '05 ) to the settings, it really improved the ride and handling of the '05.
Personally, I would spend the money every time, just to have the adjustability and option to have serviced when the time comes, but, as always, YMMV!