The only reason I didn't give this chair a 5 star rating is because it is too large for my frame (I really need a petite chair); but I don't want to pay a premium price for one. Also the lumbar support doesn't go low enough for me although it does move up and down some. But the price was EXCELLENT!
Piston sits low in the base thus minimizing the max height. Fine for shorter persons but painful for taller folk. Adjustments are plentiful. Base is plastic not metal; wonder as to its durability.
I like the fact that it comes with a Lumbar. I don't know what other capabilties it has but will figure it out as time goes on. I give it four stars because it doesn't seem too sturdy. Again no problems - but when I move around a lot it makes noise.