It actually isn't that practical. You'll either get a sore neck from looking down if you position it for your hand to be comfortable, or get a sore arm from reaching up if you position it where you can see it without looking down. Either way your hand and wrist obscure what you're working on. You're better off getting a nice monitor and a Wacom Intuos tablet. You get used to the indirection between pointing at the tablet and moving the pointer on the display pretty quickly.
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Not for the faint-hearted. You've been warned.
