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With the tablet, it's all about touch. Since it will be the primary form of input when the keyboard is hidden, it is of paramount importance that your OS recognizes all of your moves etc while in slate mode. The thing is, most if not all current ones use resistive tech, meaning you need a stylus to manipulate whatever you see on screen. This is hit or miss, as windows is not necessarily designed with this in mind, with the GUI (as in the things you see on screen) unoptimized for this usage, meaning missed touches and more annoyances that do accumulate through use. Maybe at some point they will get this under control, but they will have to offer like a whole new version altogether. Other applications will have to be designed specifically to be used in this mode as well, and you can see where the headaches lie there.
In a nutshell, you have to use the stylus just as you would a mouse. You can also use your nail, or something else that is pointy. The mouse emulation is not always spot on, however, and you will have frequent times when something won't behave exactly the way you expect it.
A better explanation can be found here 5 Reasons Tablets Suck And You Won't Buy One
The iPad, on the other hand, was designed specifically to be used with finger touches (capacitive, no stylus needed ever), which is why it's the better slate all around. Yes, its problem is specifically flash video, with the public feud between Apple and Adobe. They'll work it out eventually, and more and more people will start using html5 instead of flash (and other plugins), but that is for another story. As you say, most flash vids can be transferred with differing degrees of inconvenience (you can set up handbrake presets to do it for you, the flash vids you have downloaded that is, rather easily), but you will have it on tap whenever you would like to use it without needing internet, like in the subway, on the potty, etc.
The current Macbook Pro line is considered to be pretty much unequaled on the consumer side. On the business side it's the HP Elitebooks and the Dell Precision workstations that rule the roost though because of the ease of their upgradability and standard parts. But the iPad's convenience in the classroom is something you will have to experience on your own though (audio, ample learning aides, books available, built in mic, apps, etc.) to understand why I recommended it.
Cascaded, no screen size will deter you anyhow. Jorj95 attained SNE using a 1280*1024 screen anyway. Find out if the programs you need will run natively on the lappie, but you can always run things inside virtual machines in Mac OS X as well.
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