Originally Posted by Pliny Pads/tabs just don't have the versatility, speed or general capability of a PC or lappie e.g. copying and pasting text from browser is buggy, and they're less consvenient running 2 or 3 progs on screen at once e.g. when in a lecture or writing while browsing and running a PPT at the same time.
Copy & pasting on an iOS device like the iPad is a joy. Not buggy at all. I know that some other tablet platforms don't handle it as well, but it's really not an issue for the iPad at all.
You are right on running multiple apps on screen at once. iOS is designed to be a single application at once focused device. You can multitask and notifications have made things like running chat programs easier, but you still only view a single app at a time. Some people see this as an advantage as it limits distractions when working on things like a text document. I know some journalists have found an increase in productivity because of this.
Having said that, there will always be a need to a laptop to some people. If you are one of those people then by all means pick what works best for you. Tablets and laptops are different devices, each with advantages and disadvantages.
On a side note, have you seen what Microsoft is doing with Windows 8? I'm not a fan at all of it trying to be two different desktop metaphors at once, but Metro (the tablet UI) is looking fantastic. It actually allows for some apps to be placed side by side and run at once. Instant messaging apps being one of the top kinds for this. Ultimately, I think Windows 8 could be the next Vista because of how confusing it will be for consumers, yet there are some interesting things they are doing I would like to see Apple pick up on for future versions of iOS.