they are slow. I just finished all the gianthold walkups at epic elite at level 24 and I continue to prefer 400 more spell points over 3 metamaguc feats.
my spell power without metamagic feats is around 300 on all elements.
my main tactic is earthquake + body of the sun + wall of fire without metamagic.
body of the sun can't be empowered, earthquake does almost no damage, and wall of fire would cost too many spell points with metamagic feats.
ice storm damage is pathetic at epic elite even with metamagic feats.
storm of vengeance sla is nice with metamagic, but I would not invest 3 feats only for a 2 minutes cooldown spell.
call lightning and word of balance sla are nice with metamagic, but they have slow cooldowns, and when both cast on an epic elite mob they barely half the health of a SINGLE trash mob by dealing a total of 2500 damage... and by being single target the have low chance to proc shiradi.
I would rather prefer having 1000 more spell points and +3% critical chance by getting epic mental toughness and past life sorcerer active feat and endless faith.
I tested both druid versions, with and without metamagic feats, and I kill a lot more with the version without metamagic feats.
that's my personal experience when soloing epic elite content: remember that you will face bosses with 300k hit points and you need a lot of spell points. against melee bosses you barely have time to cast creeping cold and greater creeping cold while you run to avoid their deadly attacks... in that case, having or not having SLAs makes no difference because it's only a matter of time before the boss fall down with creeping cold spells.
if you are in group you also have only time to cast creeping cold spells on the boss, because the remaining time you will be busy to heal the melee players in your group (do you really think to deal more damage of a melee, or an archer, or a shiradi arcane caster?
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