> While I'm at it, there are a few features from 123D Design I'm missing in MOI: the ability to manipulate edges, surfaces and fillets after they've been established. 123D Design has some tools, such as Tweak and Press/Pull, that enable you to adjust the radius of a fillet and move edges and surfaces after a solid has been created. But maybe those options are present in MOI but I just don't know the right tools yet?

MoI has object history feature but it works at basic level. It's not possible to do those tweaks at the moment but Michael mentioned he has some plans of developing advanced history mechanism for non-destructive modeling. I don't know but maybe in v4...