40% CDR on Leona: Yay or Nay?
When you have 40% CDR on Leona, her lockdowns and rapid applications of Sunlight can make her really threatening in a teamfight. And a 36 second cooldown on her ultimate? Awesome for long-term fights over Baron or Dragon. However, most players insist on Banshee's Veil and Randuin's Omen instead of Frozen Heart or other CDR items. I can see their reasoning due to Randuin's technically giving more EHP and its slowing active being useful for initiates, but at the cost of 20 CDR? I say OUCH.
But that's just my opinion. What's yours?
#My usual build (Support)

Situationals

, and zerkers are probably still better than ionians.
who's melting you as soon as you get close, you may want to get
/
/ other melee carry. In most other cases, building both would just set you back, even if you do end up maxing on CDR. Even if you're looking at the sixth item in your build, trying to max out on cooldown reduction may not be your best option, even if it's very tempting.
for more damage output an silly amounts of lockdown.
for total F-U enemy adc. Stick to them long enough while they focus you and they'll kill themselves. The AS is to increase the thornmail and sunfire damage while getting a little extra damage plus some MR. Also helps other ap champs on team. I then like to follow up with

so thornmail and spell hit harder.
because of hp ap and mpen, good synergy with sunfire and thornmail
because of hp ap but also because of mana
10%
x6 cdr/lvl glyphs because mr glyphs are overrated in bot lane