Hi,

in mean-time I have also tried the trial version of Rhino. Of course I don't know all the features Rhino offers (and MoI), but at this point of investigation I can say the following:

1. Rhino has no temporary construction lines. A feature that is really shiny in MoI. Can't imagine how to quickly construct shapes without those lines. Always drawing a line as a helper is really annoying.
2. The MoI UI is really cleaned up. Focusing on the importing things while constructing. Well done! Rhino is a lot more overloaded.
3. Object selection and sub-object selection is really comfortable in MoI. Maybe I don't know how to do it better in Rhino. But this make MoI even better, because in MoI you are not facing this problem. The "always in add selection"-mode is very handy in MoI.
4. There is no visual feedback (as far as I know) in Rhino about the result you are getting when e.g. filleting or offsetting.

So far,
Sven