No doubt the AVB is a truly amazing box. The mixer and IO stuff is fantastic. Even though the weird ring mod noise rarely shows up anymore, I'm still displeased that I get some occasional isolated pops every once and a while. Maybe 1 pop every 30 to 120 min. If that doesn't bug you, get it.
I've spent lots of time optimizing my computer and use is with USB nor firewire. Still no solution on the little pops.