I himmed and hawed about spending the bucks for RRTrack. I have to say it has some pretty nice features and for the most part runs without constant blow-ups. Very stable. The learning curve isn't too bad either.
That said, I would like to see a bit more 'conformity' to some of the Windows standards for pop-up menus, better alignment to standard "drawing" programs, and customizable tool ribbon(s) for track pieces.
Is it worth the money? I have to say absolutely "Yes!". I think future editions/versions will further refine the product and make it just about indispensable in the planning processes.