I've never used on either. But it's not too hard to recover a saddle, depending on how it's made. Most saddle covers are stapled onto the shell underneath. So, it is just a matter of pulling the staples, using the old cover as a template to cut a new one, and re stapling. All you need is a staple gun, a pair of needle nose pliers, and a pair of scissors. A little time consuming, but not too hard.
I've done it a few times with good success. I don't bother with it anymore unless it is an emergency - I've gotten pretty good at sniffing out cheap saddles (no pun intended!) at swap meets, thrifts, and bargain bins, so I have a pretty good reserve pile going on.
"Love is not the dying moan of a distant violin, itís the triumphant twang of a bedspring."
S. J. Perelman