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If you're even thinking about rooting your device, do it ASAP. Your One will be wiped in the process of rooting. And the catch-22 is that you need to be rooted to back up app data! It's easy to unroot devices; it's not so easy to root them when you've got a lot of important save data.
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If you have any issues or need to send it in for repair, you can easily reverse the root and relock the device at any time, and no one will be the wiser. But in the unlikely chance that things do go wrong, we hold no responsibility for any damage or voided warranties. OnePlus does not void your warranty if you unlock the bootloader.
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Unlocking the bootloader will wipe all data. Back up any important content on your phone, and move them somewhere safe. Contacts, emails, and bookmarks will be synced with your Google account. However, some app data cannot be recovered easily.
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After rooting, you can choose to stay with Google's stock Android for official updates, or install a custom ROM from XDA for more features. If you wish to stay on stock Android, make sure you follow the proper set of instructions. Of course, if you screw up at any time, just restore it back.