I’m having a look at both the Unger ED550 Opti-Loc Aluminum Extension Pole, 18ft, Three Sections and the Ettore 44118 InterPro 4-Section Interlock Extension Pole, 18ft for some 2nd story work. Has anyone used either of these poles? And how is the performance of each, i.e., least amount of flex, weight comparision and longevity of use?