I was given a Black & Decker pole saw system and have since passed the saw to another. Works for light duty and or occasional use.
There many choices out there, I'd stick with the mainline offerings (Milwaukee, DeWalt, Makita) verses the others.
I purchased Milwaukee's Pole Saw system after having excellent service with their cordless Weed Eaters. The Pole Saw works great IMO...
Milwaukee, like others offers a few attachments that can be shared with their Quick-Lok power head/pole, i.e., weed trimmer, pole saw, hedge cutter and more.
I have other Milwaukee cordless tools used for yard work, i.e., Chain saw, Blower(s), Hedge Cutter/Trimmer and Water Pump, all good tools IMO.
I also have many other Milwaukee cordless tools, drills, impact wrenches roto-hammer, band-saw, circular saw, Sawzall and more, all have served me well. The ability to share batteries with all the tools makes since for me.