I use my iPad for business.
I'm a digital illustrator, so I use my iPad for taking sketch notes and freehand notes and sketch ideas, quickly clearly and efficiently at briefings and client meetings.
There are great styluses out there that do a great job. I'd be lost without mine.
I also use my iPad for official business accounting, client correspondences and letters, email and invoicing.
I never had a lap top, but heck, even though it doesn't trump my desk tops it's 100 zillion times better for flexible and usable on the fly and out and about, which is exactly where I need it.
There are great stylus out there, and great apps. It might be worth you persuing this path if you want to make it work.
Does the iPad work for business for me? Oh yes indeed.