Michal,
I have been working with Dietrich's for ten months and find it very useful and worthwhile. Previously I drew everything with a 2D CAD program, starting with wall and bent views, then creating the individual piece drawings (four sides and end views as needed) from these.
With Dietrich's I find that I can create the 3D model as quickly as I could previously draw the 2D views (though to get there required some training and time spent on the learning curve). From the 3D model it is relatively easy to get 2D elevation views. As Rob mentioned, it is also easy to have single timber drawings produced and dimensioned showing two sides and an end view. Bringing in the other two views if you need them is relatively easy but tedious if you have a lot of them to do.
I have been told the automated production of six views (four side views and two end views) fully dimensioned is now being developed. This will save having to bring in (or draw) the other two views.
One the more useful things I have found in working in 3D is the ability to show the rendered 3D image to clients who often can't visualize the 3D picture from 2D views. Having a 3D image on shop drawings has also been very worthwhile, especially with inexperienced framers.
I have been happy with the Dietrich's program and the support has been good and personal. Good luck with your decision.
Peter Henrikson