I have two of those pads and like them very much. Horses never had sore
backs at all. I do tend to ride light in the saddle though even when
walking.
However, I did first season, just prior to shed time see some lion
rubs. I cut back the foam inserts a bit inside and that took care of
it. Never saw it again with her new coat. But this year started
slightly again same spots. So I temporarily took out the inserts and that
worked. She had gained weight as well so figured between the two saddle
fit slightly changed.
But don't really understand why the rubs just prior to shedding and then
nothing. Very weird. But no problems, no soreness, nothing. In
fact I always get complements on how good her back looks.