Shower Enclosure: American Standard 1-Piece Glue-Up Alcove

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Does anyone have experience using this American Standard material to rebuild a shower enclosure? Typically we use 12x12 tile with a pan but a vendor is recommending this product from Home Depot.  

Doesn't seem better than tile to me...vendor is saying it is better than tile for water intrusion (Las Vegas has 3rd hardest water in the nation). 

Labor/material cost is about the same as a 12x12 tile.