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The best part for me, is that if your alk drops below 7.5, but you are actively buffering with kalk, you might not get any ill effects. I still buffer back to an alk of at least 9dkh, but it is fantastic to have that safety net. I have lost a lot of coral in the past from an overnight alk drop. I am talking about SPS here, not LPS.
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That is an interesting note. I have had issues with low Alk killing things as well. (Over use of GFO causes sudden Alk drops - oops)
It is the PH drop killing things, not so much the Alk, so it makes sense that Kalk gives you a safety factor.
Hmmmm....