[bambax]

This describes my experience pretty closely. At first OpenSCAD seems like a dream come true: just assemble a few basic shapes with only a few lines of code and you're done!

But things get complicated pretty fast, and as you say, no fillet or chamfer is a terrible limitation. It calls for complex and unpleasant/ugly alternatives (usually, extruding 2D shapes that already have the right angles).

The other big problem with OpenSCAD is that very few true CAD programs are able to import it, and those who do, don't do it well.

So it is fun to play with, but unfortunately it's not really usable for serious work.