Also very often friends ask "why you need a tablet?". I ask them to bring their pattern of computer usage. What they do for the electronic device.
If it is reading or climbing sites, listening to music and writing small texts (comments, private e-mail), the tablet is ideal.
If you want to watch videos or play heavy toys, such as "tanks", the tablet here is clearly not suitable.
Own a tablet: I only play 1-2 toys (I can live without them in principle), read e-mail, Twitter and at climbing sites (I did it with laptop or desktop and no problems) and work - typeset sites and see how it looks and works on tablets. That is actually useful - it's just business. The rest is just self-indulgence with toys and reading, which 10 years before I have done with other devices and was pleased.