I really haven't experienced the drains from the pops but when I think about it I probably wouldn't feel that it was a cheap drain as most others in this thread have said.
My collection consists of games with for the most part completely free range pop bumper action - so if you loft a ball up to the pops - you'd better be ready to have it fired right back at you. I would imagine the issue (and I believe has) been solved by using a slightly thicker post sleeve near the exit. If that has already suggested its because TL:DR.
I will say I enjoy the game on location and can't wait to have one at home.