The idea itself to free the tick hosts harmlessly from the tick is brilliant! So no other animals or insects are harmed by the poison. On the contrary, even the mice or other hosts are exempt from the pesky ticks.
The effect: This is of course difficult to say. After quieter years I suddenly had many ticks in the garden and was bitten 12x. So a counterattack was needed. Since the regular use of tick rolls four years ago I had at most one or two ticks.
Lag's the ticks roles? At least quite possible. I run anyway back barefoot around in the garden.
With an average townhouse garden a 12er Box extends well for 1-2 years.