I love the new advanced lookup experience. It was necessary to renew that old interface and a great job has been done on your part!
But I have missed something that may be really useful and that is the possibility of creating your own filters without depending of the filters of the current view. Or even create personal views in this experience. Right now we should go to the advanced search, create a personal view and then return to this dialog box.
I believe that this functionality will be very usefull.