Scaled broadband access with pppoe

Hi, I am looking for pointers or stories from the field concerning the operational challenges faced by operators of large scale broadband access, particularly those who serve lots of PPPoE. I'm interested in hearining about your pain, what heroics you have had to jump thru to get what you wanted, what kinds of things keep you up at night (or let you sleep, your choice). No sales, I'm an operator too and have my own list of pain points and just wanna compare notes is all. Thank you. Mike-