At the time I got it, I was unable to use the “rectangular selection tool” to select a group of voxels and either separate them into a different matrix or move them to a different position on the model. Is this no longer the case?
Then they must have changed it, and that part of my criticism is not valid. That said, VoxelShop serves my admittedly limited needs admirably, so I feel no urge to spend money on an alternative.