iBook quality is very good and stable. Generally, you don't have to buy Applecare. I handled a couple of hundred ibook. So for none of them use it, though my company did purchased the plan. In the U.S. you can always get support (reguarding configuration and customization) from Apple Store in the shopping malls for free.
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Of course, you can also ask your question here, the WXC 實用電腦,to get and answer free!