I've been using my
X40 w/the VacuVin mod (game changer, btw) for 13 months and have gone from a starting size of 6.375"X5.25" to 7.75"X7". I do it in the shower, once in the morning and once before bed for at least 15 minutes, but sometimes up to 30 mins. I struggled with my right testicle getting sucked-in, (yes, all recommended 'fixes' were attempted, just my biology) but I've become used to the feeling and it now kinda feels okay. One problem I was having with the
X40 toward the end of my session was the dreaded
gaiter bite, so I purchased the
Goliath thinking the extra room would help...which it did, but it took some time getting it to work. What I've been able to accomplish utilizing both the
X40 and
Goliath has been nothing short of amazing, almost to the point of an addiction for me, (I actually miss my
BM sessions if I'm w/my girl over night).
What works for me is starting with the
X40, slowly pumping to my current max of just a shade over 20cms and I keep it there for 10 mins. or so. Once I'm fully pumped, I switch to the
Goliath. Going in with at least a 90% erection helps displace enough water to maintain a good seal, but I have rapid-file the VacuVin pump to get it to work properly. I can stay in The
Goliath for as long as I want with no bite or discomfort and my post-pump girth is off-the-charts!
Long response to the OP's question, but definitely upgrade as needed...there'll be a steep learning curve, but well worth it!
p.s. I've tried to post a pic of me in The
Goliath that kinda shows the VacuVin mod, but it won't upload