It was just the opposite with my wife/Admiral/stoker-navigator. We went several seats for her (Specialized & Terry), but the Terrys were tolerable at best. Then she tried her Brooks and never looked back (once all the minute adjustments were done over the course of 2 months)(Tandem rule #1: keep the stoker happy!).
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Jeff
Learn from other people's mistakes. You won't live long enough to make them all yourself.
2004 Co-Motion Speedster
2010 (Specialized) Carmel comfort (my neighborhood bike)
2008 Raleigh comfort (wife's neighborhood bike)