I have. Sometimes I have to use many different saddles on different pedicabs that I have ridden.
They used to make two different Planet Bike ARS saddles, one of them was a lot better than the other.
Stay away from the lycra covered gel version. Crap.
The harder pleather covered foam saddle is actually ok for a lower cost saddle, comfortable even. They just don't last that long under heavy duty, all the time use. Like maybe 1-2 years, where my more expensive saddles have had a longer life but not necessarily more comfortable. I think rail position, tilt, and amount of padding have the most effect on the overall feel of the saddles. Once these factors are handled, I am able to ride on many different makes/manufactures of saddles.