Cinema 4D has a really good feel to it and is really well designed. But it still can't do decent fillets. Or perhaps somebody can show me otherwise?
I try filleting the intersection between two overlapping primitives by using a boolean union operation and having it auto select the resulting edges. Then I extrude the edges, but the result is nearly always quite messy.
Now take MoI! That program makes beautiful fillets. Well sometimes it fails to make any at all, but when it does make them, they're lovely!