No problems ever, it just works and given that it has the most open, extensible and developer friendly environment of any proprietary system it's the obvious choice for serious developers of code.
I currently have several Macs and MacBooks, iPad and iPhone and it all just seamlessly works together.
Most of the people who have issues with Macs would probably be challenged tying their shoelaces, some people are just inherently stupid and probably shouldn't be using any kind of computer anyway.
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