I have an iPad (which, in Apple speak, ought to be written as "I have iPad", which makes it sound like a disease
). I needed to replace my nice but ageing tiny Sony laptop so took a chance with the iPad. It has proved to be superb for business use - taking notes during meetings, giving presentations, checking and responding to emails on the road, browsing the web. Through its VPN I can access scientific literature in protected databases and read the downloaded manuscripts using the excellent screen.
I'm no Apple fanboi. I dumped Apple 10 years ago when OSX came out and made it impossible to work on a Mac for more than 30 minutes without a crash. Apple software is still poor, IMO - iTunes is really clunky and falls over regularly, for example - so I don't see myself ever going back to the Mac as a main computing platform. However, for business and leisure use requiring portability, the iPad is a terrific piece of kit.