How good is your backup system? If, and/or when it does blow up will you be able to easily go back? Are you willing to accept that you will almost certainly have to reinstall Windows when then next release or patch comes out? Do you have the tools and ability to actually backup your data under Windows 8, so if you have to re-install, you can accept that and do it easily?
Microsoft did not support converting from any of the pre-released versions of Vista/7 to a full version. I don't believe there is any reason why you should expect them to support it here. Microsoft doesn't even support using a pre-release of service packs, and this has cause problems for many people in the past.
Based on Microsoft's past release behavior, if you try to use this as your main OS, you will basically be at a dead end from a upgrade standpoint. Your system will almost certainly not be getting security updates, you may not have any ability to update or anything. You will not be able to patch or anything.
The dialog you clicked past when you downloaded it had this to say.
The Windows Developer Preview is a pre-beta version of Windows 8 for
developers. These downloads include prerelease software that may
change without notice. The software is provided as is, and you bear
the risk of using it. It may not be stable, operate correctly or work
the way the final version of the software will. It should not be used
in a production environment.
You can't uninstall the Windows Developer Preview. To reinstall your
previous operating system, you must have restore or installation