Herman Miller vs Sidiz: Is a $1,300 Chair Worth It

My back sent a warning

I sit more than 10 hours a day. Eight at the office, 2-3 more at home on side projects. Starting last fall, a dull ache appeared on the left side of my lower back. First I thought "rest will fix it." Two weeks later, still there.

Went to an orthopedic clinic. "Posture issue." Stretch more, change your chair. At that point I was using an 89,000 KRW ($66) mesh chair from Coupang (Korea's equivalent of Amazon). (Bought it three years ago. The mesh had stretched so much the seat drooped like a hammock.)

Narrowed it down to two contenders

Started researching ergonomic chairs. Prices range from $150 to $1,500. After three days of reading reviews, the serious options came down to two.

Herman Miller Aeron: about $1,330. Supposedly the gold standard of ergonomic chairs. Sidiz T80: about $660. Korean brand, known for value. (Sidiz is the dominant office chair brand in Korea.)

Nearly double the price gap. But when I frame it as "money spent on something I use 10 hours daily," is a $670 difference really that big?

Bought the Sidiz first

Went with the Sidiz. Simple reason: I didn't have the guts to spend $1,330 on a chair. $660 is already steep for a chair, but at least it's less daunting than the Herman Miller.

First impression was great. Coming from a $66 chair, everything felt good. Lumbar support actually cradling my back, seat depth adjustment, 4-directional armrest control. After two weeks, back pain was noticeably reduced.

But complaints appeared after a month

The mesh seat's springiness becomes normal surprisingly fast. The initial "wow, this is comfortable" becomes just "a chair" after a month. Particularly beyond 4 hours, I felt some pressure on my sit bones.

The headrest also didn't quite match my neck position. At 173cm (5'8"), even maxed out, the headrest doesn't fully support my head. That's on me for not trying it in a store first.

Went to try the Herman Miller

About two months into the Sidiz, I visited the Herman Miller store in Gangnam, Seoul. "Just gonna sit in it, nothing more."

The moment I sat in the Aeron, I felt the difference. The Sidiz is good, but the Aeron's mesh distributes weight more evenly -- I could tell even without instruments. People say the long-sitting butt pressure is lower, but comparing accurately from a 30-minute store visit is tricky.

But could I spend another $1,330? Already put $660 into the Sidiz. That's a $1,990 chair experience total. (Selling the Sidiz secondhand would help, but...)

Didn't buy the Herman Miller

I considered selling the Sidiz used, but selling a 3-month-old chair felt wrong, so I stuck with it. Back pain improved substantially with just the Sidiz, and I'm supplementing with stretching.

The Herman Miller is probably the better chair. But is it twice-the-price better? Hard to say. Feels like 30% better for 100% more money.

The real fix wasn't the chair

Three months in, here's what I learned: even the best chair is useless if your posture is bad. After switching chairs, if you don't fix the habit of looking down at your monitor, your neck still hurts. If you don't build the habit of resting 10 minutes every 50, you'll still get stiff.

It's a trio: chair + monitor arm + stretching routine. The chair alone doesn't solve it. If I'd known that from the start, the $660 chair would have been plenty.

Anyway, my back is fine now. That's what matters, right?