If the battery or replace the display on the HTC one, one comes to the destruction of the device around barely. iFixit are even convinced that in the case of repair would be cheaper to buy a whole new expensive than HTC REPAIR.
The teardown site iFixit disassembled in a beautiful regularity, the latest and most expensive gadgets, and rated their repair capacity. Many device manufacturers fear while the results of iFixit. Because often expensive and / or highly regarded devices such as surface, iPad, or iMac from the portal were poorly rated because they are not bolted but glued and thus changing the possible defective parts is difficult. Also the HTC one cuts off badly at iFixit. Because when you open the HTC one to get according to iFixit destroying the device hardly around. Blame this time was not too much glue, but the solid construction to the HTC one, which prevents easy disassembly in the items.
For comparison: The iPhone is universally complained that the battery is bad exchange. Still gets the iPhone 5 at iFixit 7 out of 10 for its repairability. The HTC one is just on 1 of 10.