I think seats are very personal items. I know several folks who like the Spencer Seats, but I thought they suck. I tried one and was glad I did not spend too much money on one. Was about 10% better than stock for me, but no better. Still was not able to tolerate it for more than an hour.
I am trying to modify my own seat at present. That effort has make it much better than stock, but still far from perfect.