Xbox One Ties PlayStation 4 in iFixIt's Teardown Analysis, Both Easy to Repair
According to iFixIt's teardown analysis of the Xbox One, both it and the PlayStation 4 are equally easy to service at home. The PS4 received the teardown treatment a week ago and earned an 8/10 "Repairability Score" for being so easy to open and navigate, especially since there wasn't an ounce of adhesive to be found.
Image Source: iFixIt
Likewise, the Xbox One proved just as easy to open up and navigate, and it too doesn't use adhesive. Only a few tools are required to take the whole console apart, and the opening procedure is similar to (though much easier than) that of any Xbox 360. If you have experience taking apart an Xbox 360, the Xbox One shouldn't give you any trouble.
iFixIt also lauded the Xbox One's "clean, no-nonsense modular design." This makes it easy to access and/or replace the drives, fan, heat sink, wireless board, and daughterboard.
Image Source: iFixIt
As is usually the case, it wasn't smooth sailing throughout. The Xbox One uses annoying clips instead of screws that make opening the chassis more difficult than it needs to be, and the hard drive isn't real easy to access. Otherwise, however, Microsoft deserves kudos for designing a machine that's mostly easy to work on, should the need arise.