Indeed, Styles = Layers.
Groups work more like "named selections" to me, they are not really groups but it can stay like this, not that much of a problem for now.

This is what me and like 10+ people who have tried MoI need so far:
- Instances;
- Cutting planes;
- Constraints\Dimensions;
- Better project organization (either nested groups or some type of hierarchy);
- Fix the object stack when working in isolation mode to improve latency in big projects: fluid workflow is one the main features of MoI, no, is the REASON we use MoI.

I'm stopping here since I know these will involve a massive amount of work.

Max.