A tablet will add things not possible with the mouse:
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pressure controls the size of brush or the opacity, or both (depends on software)
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angles can be detected by some tablets, to orient the brush image, or distort it (depends on software)
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less strain on your wrist, more natural feel after a short learning curve. (the swivel buttons on the side - consider an Intuos or other tablets with helper buttons on the tablet frame).
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easier to trace a template
Some software has dryout effect in their brushes, feels like transfering paint from the brush to the canvas as you go, and if you have a pen-like stylus in the hand it will feel all the more similar to real painting with real brushes.
One drawback: there’s no thumb-wheel (or middle button). But some tablet models have slider pads, which may be programmable to simulate thumbwheel action in some software.
Some software doesn’t work the same with a pen. Carrara for example has problems with the viewing controls. The scene spins out of control like crazy when trying to dolly around the scene with the tablet pen.
So don’t loose that mouse quite yet. But yes, other than that I’d say you’ll want a tablet some day. Like today.
I resell them at a discount through Tigerdirect - shameless plug: http://www.thebest3d.com/tablets
I also have other brands listed on www.thebest3d.com/dogwaffle/links near the top
I have used Acecad Caecad Flair, Aiptek, Pablo (very cheapo) and Graphire 3 from Wacom and Intuos 3 from Wacom - I love the Wacoms. They’re hands-down the MErcedes-Benz of tablet makers, IMHO.
But as such, they’re also the pricier ones.
I have a thread on the hardware section of this forum to learn more about the Adesso tablets - anyone know them? They look very similar to another one I’ve seen, perhaps Nisis? Dunno for sure, might be an OEM variant product.