Yes instances are really important for me and im sure most people. I think mention of streets of houses has thrown things a bit, but an individual building is possible with moi and in that there will always be a need for instances. I don't think they even need to be too 'intellegent' just a co-ordinate transfer system where moi just remembers the co-ordinates and rotation of the clones and just copies and replaces the previous version, obviously this would work on a group and I would think require an 'update instances' button so moi isn't trying to calculate everything in real time. Thats just how i see them working - of course there is the question of how they will respond as a boolean opperator etc. so history will play a big part too! Hope they are high on the priority list!

Cheers
Rob