Ok I'm pretty new with LEDE but I get Linux just fine and can figure out most things.
Installed the 4 May developmental LEDE, then installed luci, then installed the luci-sqm and enabled it as per the wiki.
Ran the DSLReports test several times with A's and A +'s, no crashing. I previously wasn't aware of the sqm deal in LEDE and think it's pretty awesome. Although at last count I have way too many routers to deploy in my home, LEDE on this DIR-860 make me want to deploy it somewhere. It's a beast for the cost.