In addition to raising and tilting seats for correct posture, some seat pan inserts also adjust sitting pressures under the buttocks and tailbone. Special contour and cutaway sections can help people with hemorrhoids or with an enlarged prostate, with injury to the tailbone or anal areas, and after pregnancy.
However, when a seat pan fits poorly it can make good backrests and ergonomic desks ineffective. If you are tall, a seat cushion may compromise head room in your car. A seat cushion will also change relationship of the backrest to your back, which could be a good thing or a bad thing in your case.
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