No matter if stable enough or not, ReactOS is aimed to replicate a NT based system, as such it can be very different from DOS/Win9x.
Quite a lot of (DOS based but not only) tools and programs (particularly any low-level one and - generally speaking - games) that run just fine in Windows 95 won't work on NT 4.00/2000 and later, and they as well won't in ReactOS.
Quite a lot of (DOS based but not only) tools and programs (particularly any low-level one and - generally speaking - games) that run just fine in Windows 95 won't work on NT 4.00/2000 and later, and they as well won't in ReactOS.