Hi!
I found MoI great tool - of course, there are not many options, or functionality, but it seems to be very good app.
For now, I'm using SketchUp - it's realy handy tool for architecture/arch visualization, BUT...
There is a lack of commands for filleting, chamfering, etc. Also, big disadvantage of that app is that it works on polys, not NURBS - modelling arc-shaped or other 'soft' shaped objects is very "painfull"...
If only MoI can have posibility to draw new shapes on surface of objects, snapping to three axes and push-pull tool (all like SketchUp options), it would be my (and many others) tool of choice :)