You can download their prochure and read this from their site
Top 10 reasons to move from AutoCAD to AutoCAD P&ID 2007
1. Industry standard P&ID symbols
AutoCAD P&ID includes complete P&ID symbol libraries conforming to standards for PIP, ISO, and ISA. Easy-to-use tool palettes provide quick access to equipment, lines, and components needed to create P&ID drawings.
2. Easy to learn interface
AutoCAD P&ID is built on the most up-to-date version of AutoCAD and leverages standard AutoCAD features. The modern interface enhancements of AutoCAD P&ID significantly reduces the users learning curve and drafting time enabling them to get productive and up to speed within hours of first using the product. If you know AutoCAD, learning AutoCAD P&ID is easy and maintenance doesn
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