I've done two BN events. I'm aware that sounds like it'd be ridiculous to move up, but because Margaret agrees we are ready, and I've schooled novice fences, drops, jump skinnies regularly, etc, I don't feel that we're not ready.
Success-wise, we went double-clear both events, and our dressage... well, you know how our first event went. xD But the second was much improved, and we went to a few dressage shows and placed well after that. We've also been training all winter, and have come a long way since our debut event. I figured I would do the CANTER benefit at BN, then try the Battle Creek at novice. If BC is a flop... we can always move back to BN. It's not Zip's ability that worries me- he clears anything I point him at [assuming I'm not too large a distraction] up to four foot six, it's that I might screw him up.