Yeah, same as Sammy, the new builds of OpenBOR still work on Windows 10. Dunno if the tools (for compiling OpenBOR from source) still work.
It's been almost a month since 10 was released, there wasn't any noticeable problems so far. Some annoyances though, but otherwise not that prominent.
It really just depend on your taste actually if you want to upgrade your machine to another OS. I remember when iOS 7 came out and I want to upgrade my 2nd Gen iPad and my dad doesn't allow me, stating that if in the future that the second gen would be obsolete, at least I preserved everything that's in it including the OS. After he died, I still didn't upgrade my iPad, because aside from preserving the contents, I couldn't risk updating it with the problems and all.
For the Windows comp though, I didn't mind upgrading as my comp is good enough to run it (plus the fact that I'm using 7 Pro and it would upgrade to 10 Pro also gave me a plus).
So again, your choice if you want to upgrade or not, preserve your comp as well as your OS, or risk everything and upgrade (unless you know and understand the risks that come with it)