I had never sat in one of these before. Haworth offered a 30 day trial with free return shipping, so I gave it a shot. I had heard that it was a great chair. I'm here to tell you, it's beyond my expectations. I'm not even going to use the trial, I threw the box away within a couple days. I knew immediately that this chair was a keeper. It's easily the most comfortable office chair I've ever sat in. It looks great as well. Such a beautiful piece. I'm more than thrilled.
I opted for the digital knit back and forward tilt. I did not add a headrest or lumbar support. I firmly believe these were the right decisions. I am 6'4" tall and I've read that this is not a good chair for tall people. It fits me like a glove. I also have the 4D armrests. The adjustability with them is great too. Plenty of different configurations. They're a little more firm than I'd like, but not a big deal. I did get the aluminum base and I think that makes the chair feel more sturdy and premium. I'd recommend getting that option as well.
I really can't say enough good things about this chair. I never leave reviews, but I felt I needed to on this piece. I read and read and I wish more people left reviews on this chair, so hopefully this review helps someone else out there.
Tldr: Get this chair. You won't regret it.