You do not need to go back. If you continue using genuine (not leaked) Windows 10 Technical Preview, then you are on the proper path to the final version.
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Right, but the release you are using now is "official" and also your SP3 has your original W8.1 key locked into the BIOS. When W10 comes out, you should be able to go straight in with an official license as it seems to stand now. But we all know it is MS and something could change. You could need to wipe and install clean, in which case there is a tool that can access your W8.1 key from the BIOS if needed.
sharp... GT... thanks a lot for the explanation.