I haven't tried Cummins, but I know a lot of people here recommend them. A couple of my pears that died back were from St. Lawrence Nursery and were supposed to be cold hardy and I believe a couple other pears were from Woodstock Nursery in WI. I also had a cherry die back last winter as well. My apples seemed to do pretty well, but most of the other fruits didn't fare as well. Even though the tops of some of the pears died they ended up sending up some new growth from the main trunk, so they're still alive. It will be interesting to see if the pears can withstand a colder winter when they get older or if they will die back once a decade or so.