I also bought an Aeron. But in my case I'm round (don't get run over by a car, or you'll end up round too). The gas cylinders in the "inexpensive" office-depot

I also bought an Aeron. But in my case I'm round (don't get run over by a car, or you'll end up round too). The gas cylinders in the "inexpensive" office-depot type stores wear out after about 6-8 months, so they end up costing more than an Aeron after about 4 years. If you're the sort of person who puts things in their backpockets - DON'T! Even a thin wallet twists your butt enough that it ends up causing backstrain.