It's no secret that Sony has been a long-time supporter of the custom ROM community, but now the company has released a tool that lets owners of bootloader unlocked Xperia devices easily return back to stock firmware from a custom ROM. According to Sony's blog post, this tool has been oft-requested by the community, so it's good to see Sony deliver on that.
As mentioned, use of this tool requires the bootloader to be unlocked on supported Xperia devices, but past that, it seems pretty simple and intuitive to use. A tool like this is fantastic for anyone who's on the fence about running custom software on their phone, as it allows them to easily return back to stock. I just wish other manufacturers would follow Sony's lead.
For more info, including where to download the tool, head over to Sony's Dev Blog.