My tablet is old enough to be the only device now using a serial port. New, they are only available with USB connections.
A6 size though it didn't carry that name when it was born.
Without a doubt in my mind both mighty useful and totally reliable.
I used it instead of the mouse for a long period, but found it produced a burning muscle tension pain in my shoulder when used like this for long periods. No such problem if used in a graphic for freehand drawing and fine detail stuff, like cinching an object or masking.
I bought a tablet from a puter fair,for use by my daughter.Its only drawback is its size(smaller than most mousemats)but with a little practise,can be used to great effect(it also has a collection of tabs around its mat,for launching email,etc)It only cost £15,but my 7yr old adores it,and M$ paint.