Honestly it is a great boost to your time. I get at about a 40% reduction on average. Probes required/Probes used (for me) 2/1, 4/2, 6/3, 7/4, 21/14. So yeah, I highly recommend it, esp if you are working a long voyage. A lot will depend on working out your optimum shooting range, but easily figured out as you use them.