[NF] Recommendations on a developer seat cushion?

OK, I realize this is a rather [NF] but list traffic is low, its summer ... and well, I'm looking for a comfortable "developer" seat cushion and appreciate the wisdom of this crowd. I know, I'm a bit embarrassed by the "developer" adjective, but trying to keep this thread somewhat on topic :)

I'm looking at the ComfiLife Seat Cushion (Amazon, $35) but not excited about some of the reviews. Also overwhelmed with the number of options in this space. https://www.amazon.com/dp/B014F18ZGU

Suggestions?

Mal

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