It really depends on how picky you are. Machined wheels are hard to refinish without the whole wheel being refinished. However, painted wheels can be fixed up cheaply and easily. This is part of the reason why I'm struggling with what wheels to buy. I *want* a machined wheel, however my dear bride drives my car occasionally, and reminds me why that's a bad idea with her misdeeds.
Scott in Cincy
2011 335i X-drive, Sapphire Black over Oyster Nevada (no mods yet, getting there)