DS has had the Hill Rom Vest 104 for the past month. Frequency is 10, 12, 14 thru out a 20 minute time period. Pressure started at 4 for the first week, up to 5 and now at 6. He does complain when we first start that it makes his tummy hurt -- we start at 14 and end at 10 for the last evening treatment. Sometimes it's just a matter of getting slouched, scrunched down on our bed and he can't see Spongebog. And once in awhile he lays on his side, propped up on the side of the couch and that seems more comfortable for him, but it's rare 'cuz he might fall asleep and miss something important.