[quote name='Naterrs']I already have it for PS2, are there any good reasons to upgrade to the Wii version?[/QUOTE]
Depends. If you wish the brush mechanics were less slow and deliberate, and more quick and gestural, then the Wii version will feel great to you. But if the slow, zen-like pace of painting with control sticks is preferable, the the Wii version will feel like a step backward.