In Inventor 2017.3 we have the ability to mirror constraints or ground components after mirroring, which is great... But...
It would be much better to have the option to mirror components as some kind of assembly feature. (I think Solidworks has something like this?) So that it would automatically update the mirror if any parts are moved or change. There would also then be the option to edit the feature and add or remove parts from it.
I use component mirror a lot and this functionality would be extremely useful!
