I have used Cusinart food processors for 40 years that have been the same size and have operated basically the same.  This model I am still adjusting to with the double bowls, how differently it locks, and the larger size of the accessories. If I had to change the design, I would not have a bowl within a bowl.  Instead it would be a separate bowl that also fits the base.  That way the larger bowl wouldn't be a risk for also getting dirty.