I like using a tablet, I get better precision than with a mouse, tho that might just be my hand.

The other thing is that if you have multiple input devices, you can switch between them. For me, this has proved a really good way to avoid repetitive stress injuries. And although spending money for this reason may seem a bit luxurious, having injured my wrist in the past, I feel pretty confident in saying to that 100 dollars would be a bargain when compared to the costs of time lost and treatment.