I've used non toxic for monitoring ongoing contracts for 10 years or more, same with Break backs in AF boxes, both rat and mice.
I see the reasoning behind non toxic monitoring baits, but I do have questions about their effectiveness, just the same, any bit of action and you can get some proper bait in!
I rate the boxed break backs, as they basically funnel the rodents to the killing zone and personally I find the success rate high.