I've got the 120cm aluminum ones. They're light, strong (I don't understand others' comments to the contrary), and they fold and unfold easily. Now for the gripes:
1) The grips are too thin. Maybe it's not a problem for others but I have long fingers and there's just not enough there to wrap around. I had to augment mine with some foam rubber handle thingies I pulled off a couple of $3 ice scrapers.
2) The tiny little baskets are of minimal benefit on soft ground or snow, but are tenacious about hanging in brush. I mean unbelievably tenacious. Not just brush–they'll hang on sticks and logs and rocks, too. Honestly, it's like hiking with fish hooks on the poles. And they're not removable.
3) The over-designed right/left straps are unbelievably hard to get on and off over gloves. I mean unbelievably hard. So hard that I usually just let the poles hang on my wrists if I need to do anything with my hands (like take a picture). Without gloves, they slide on and off without any trouble.
I've used mine for about 1.5 years, and will keep using them for now, but I wouldn't buy them again.