I have taken to borrowing my wife’s trekking poles when I go on my long hikes in Whiting Ranch. The big question that I suppose you are asking is whether they help or whether they are just extra weight. They do work as advertised, helping me on both uphills and downhills.
As you know, I am not a strong climber due to my heart defect, a narrowing of the coronary artery. This is as it sounds — one of the arteries feeding my heart has a section where it attenuates. It means that I have to watch my cholesterol and moderate my speed on uphills. The trekking poles help me go a little faster. I struggle less and can go farther on steep stretches before I tire.