I live in a black bear heavy area and have the Parmak Deluxe Solar. Bears did test it fall of last year and have not been back since. They pass it probably a few times a week, going to a dumpster food source, and they have not tried it again. Because of the warm winter in the Northeast I didn’t take the battery out for fear they would get in once the temp dropped. Battery stayed good and the unit has been great. The 110 volt plug in Zarebas for my horses elec fence needed service after 6 months, BUT it did get fixed free cause it was under the 1 year warrantee. So I have to say they do stand behind their products. I would vote for the Parmak Deluxe and save a few bucks as well. 2 yr war on the unit. I paid 166 and I see them now for 171 at Valley Vet dot com, the Magnum was 279 so save the 100 bucks, I know the one I have keeps them out. :-D