I consider my selfe to be a very advanced user of this type products and have a very impressive set of DDDs to show for it. I recently purchased a set of the Xtra large and a set of the Xtra Xtra large Domes. My daily routine consists of a couple hours with the Xtra large sets and then a couple more hours with the Xtra Xtra large sets. When I start my session with the Xtra large set, my nipples which are extreemly large already from previous pumping, Almost touch the bottoms of the domes and after an hour or so, they are touching the bottoms and the domes are almost full of my breast tissue. When I switch to the Xtra Xtra large set, my nipples almost touch and do touch within approximately an hour or 45 minutes. I also nicie that the domes are almost full of breast tissue and I thing within the comming months the XX domes will be completely full of breast tissue. Naturally there is some shrinkage between sessions but I've noticed that my DD bra is maxed out and my E bra is starting to fit nicely. My goal is to be a permanent DDD/E or maybe larger with no sag. I modifided the base of the XX domes for more comfort and found the optional seals to be useless. Attached photo was taken yesterday with my 40DDD/E Lavinia bra.