Sweet Knolly.
Even if you go with a bash, you'll still need something to prevent chain drop on the inside. I've been running the N/W rings for a month now and haven't dropped a chain. Previously running a standard SS chainring(before the N/W arrived) and dropped the chain 1-2 times a ride. Before that, I ran full chainguide w/bashguard.
The N/W setup is so clean, but I think it's only a matter of time before I bend it. I tend to bash into things, so I probably should be running a bashguard just for added protection(not to keep the chain on though).