How does this application benchmark with LEGO Digital Designer? [1] I see that LeoCAD supports Linux while LDD not.

[1] http://ldd.lego.com/

Having used both, LDD has a much better UI, but LeoCAD is probably overall the better program. It's able to export to more file formats than LDD, and is generally more of an open program.

The difference is comparable to Maya (LDD) vs. Blender (LeoCAD).

I'm glad to see the ldraw community is still alive and healthy. I haven't played with LEGO cads since the MLCad [1] days.

[1]: http://mlcad.lm-software.com/