So the supplied benchmark results (even from a 7 years old version DWG2010, not from the latest) show at least 9 errors (from 28 tests), just in the modelspace. This 68% reliability is not bad (there are worse examples of AutoCAD lookalikes) but it is far from the expected 100% DWG compatibility. As said before, there are situations where none of these potential problems will occur or when some differences will not be that much a problem - but you can never be sure...

Vladimir Michl wrote: So the supplied benchmark results (even from a 7 years old version DWG2010 Error cases: #2, #4, #8, #15, #17, #20, #24, #26, #27

Interesting, but I must admit I don't quite understand.
(DWG2013 yielded same.)
Error cases:
2: It is identical to same frames opened in TrueView.
4: It is identical to same frames opened in TrueView.
8: Euro symbols are identical.
15: It is identical to same frames opened in TrueView.
17: Same as frames opened in TrueView.
20: It is identical to same frames opened in TrueView (but plotted output doesn't display circle).
24: It is identical to same frames opened in TrueView.
27: Same as frames opened in TrueView (red values are different)..uploads/413522/budweiser2013_Layout1.pdf