Greetings, M.R.
I have only good things to say about my VacuTech pump, and about the service I got there (I have no connection with the company, and I don’t live in the U.S., so I’m also commending their ability to handle international orders). I don’t measure after pumping, but with a cockstrap, which I also purchased from VacuTech, and which I wear for an hour or so after a pumping session, I am fuller and heavier in the flaccid state. The bulkier look can stay overnight, and sometimes until the next day’s pumping session.