can't comment on the pss in the 30 pilot. we have a 34 pilot. we had the tides seal replaced last year. it was 17 years old. honestly, bellows looked in great shape. we have pss on another boat and they're 10 years old. i don't plan on replacing anytime soon. both tides and pss talk about commercial boats that have been in continuous use for 20 years. i think wear on the carbon disk is the wear issue you need to keep in mind.
disclaimer: this is my opinion.
GEM 2003 P34