Ours is almost 9 years old no cracks. I agree with previous comment, a crack suppressant layer must be installed, I have done this in the den, and the material looked similar to the felt paper used under shingles. Both Lowes and Home Depot sell this, but the product they sell is very expensive. This material will stop a crack from getting through to the tile. If your lanai has a previous coating (cool step, paint, etc.) you may need to have this removed for proper adhesion of the crack suppression material.
On a side note, there is typically a 10 year warranty for structural problems, but if you were to have one the repair does not cover anything applied over the concrete.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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