The iPad will be the thing that changes all this. Although the things it does better than laptops – smaller, more durable, longer battery life, doesn’t need a table to be useable – seem more evolutionary rather than revolutionary, in the context of construction field workers, it’s the difference between using a tool that almost works and a tool that is able to get the job done. It’s basically the first computer that is usable in the field and as a result it’s starting to be rapidly adopted by construction companies.

via PlanGrid – Blueprints on the iPad for Construction.

This statement applies to all tablets, not just the one branded IPAD.