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I would be hard pressed to justify paying nearly double for something which does the same job.
Sounds like we need to rush a transfusion of Apple colored blood across the seas!

In all honesty, I suspect that "Apple" doesn't actually build these routers. They for sure
design them and add certain bits of ROM to make things more compatible with their computers, But I suspect they are produced in the same foreign factories that Linksys, NetGear, etc. are also made.

The fact is, Apple does a few things to assure that the hardware works well with Apple's hardware. The others don't do that. YMMV.
The fact is, Apple does a few things to assure that the hardware works well with Apple's hardware. The others don't do that
Unless you need Appletalk, like Mayo, or a "Wizard" style setup there's not much else that Apple can do to Tweak things.
OS X is based on FreeBSD and uses it's TCP/IP stack, indeed many of the routers out there are based on FreeBSD. So it all comes down to routing data and that is the same whichever OS is involved (lets not get into too much theory, please
IIRC at one time even Microsoft used the FreeBSD stack as well, although they never actually admitted it