The meta gem i found to be quite good when it procs.
Because it procs quite nicely and im stacking mastery/haste i cant use Volatile talismen of shadopan with it (no luck with maegaera trinket or cha-ye)
Good news is i can use Relic of Yu-Lon which combined with wushoolay gives a whole new fun called big crits.
Also got a new weapon hehehe better than the 504 i was using at time.
So far my highest crit just raid buffed and all CD's procced is a 1.24 million chaos Bolt.
I would love to imagine how hard i could have crit with chaos bolt in the old sac build. Because i have managed 800k+ crits in old sac build with relic and about 484 ilvl.
Hopefully the legendary meta will improve proc rates for destro locks that have been stacking haste, i also heard the internal cooldown has been removed like it was originally.
You say go all haste or all mastery.
I need to lose a bunch of crit but at least the stats are not so bad, it gives a nice all rounder seeing that stat weights are getting close, that and my guild has a policy of take loot as an upgrade even if its minor