I've played like 10k BB games from CT-CSE and P4A with a friend of mine in CA, we have 3 bars constantly and 0 problems. GG is completely unplayable for us with horrible delay and random speed-up slow-downs.
So there's my experience with GG netcode.
As for CP, I really hope they implement P4A's lobby features in CP (autopass, pass timeout, etc.)