Is been some time since I demoed spaceclaim so Thinks may different now but when i did I cant say I was impressed.
1:RealDWG support = Not So Real (that's were inventorfusion will do a better job)
2:3DM Import = No support for polygon mesh data and very poor support with nurb surfaces.(hope MoI will do a better job there)
3:LT and LTX are limited in terms of data exchange capability and the lack of API support.
4:Not Mac or Linux support
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Direct-modeling is for sure the new trend.
Direct editing is great because it allows more interaction with the 3d model and is better in the conceptual stage of design where the design may need radical changes.

MoI integrate solid modeling with free-form surfaces really well and if Michael could explore the possibilities of Direct editing that could turn MoI to power house.
(Currently CAD systems like that can be counted on one hand but None of the has MoI Factor).