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Reminder, you spend more time in a chair clicking Adobe than you do clicking your camera outside. As with anything that forms a barrier between you and gravity, quality and ergonomics are paramount, What you sit in is important to your health.
I use pic related, and it's been amazing, I finish a session at my desk and have none of that heavy, groggy, stiff feeling that I used to get on my old chair (generic, but High quality office chair, was $500)