from what I can tell reading online reviews, the focus "slop" is variable (e.g. a quality control issue?). My ED3's have essentially no slop in the focus wheel.... not quite the same feeling of perfectly machined precision as the Vortex Vipers I tried, but there is no "wiggly" looseness like the ED2's I tried.
My pair is more "wiggly" I would guess, looks like my ed3's are sub-par.
I still love the view but the focus thingy still bothers me.