Yes I helped with the beta testing with the one just before the razor version and used to run it with trainz, if you have problems running trainz because your computer is at the limit of Tec, that trainz will run with then I can strongly recommend it, plus it's free.
On the other hand if your computer can easily handle trainz then apart from stopping some programs that are working in the background that might cause the odd glitch you won't see much difference.