SH5 is quite complicated sim so don't expect 100% bug-free ride, but TWoS is generally stable, few recurring issues that can't be fixed are well documented in TWoS manual and vdr1981 provides hell of a lot better technical support than Ubisoft ever did in case you report a bug. You shouldn't run into any game-breaking issues on your way to glorious surrender in May 1945
Make sure you follow the installation instructions to the letter, most of reported bugs with TWoS can be tracked to mistakes during installation process.