re: conventional vs post tension slabs?

(Puts hand up in air)

One bad concrete load ruins entire slab.
You can't cheaply effect a fix, it's a system which has to have no defects.

Poorly consolidated concrete around PT anchors.

PT cables missing, misplaced, misrouted, cut or otherwise compromised.

Huge full-depth cracks in slab occurring before stressing. Does stressing "heal" them? I wouldn't want a slab like that.

It isn't enough difference between them to risk the lesser quality option. We have 150 years+ of conventional slab history to look back on; how does PT age? Not well if chlorides are present in the concrete.

Ask WalMart's Construction division what they think of PT.