I have a Racesafe and I have used it for general jumping practice as well as on my first fun ride last summer.
It was a little warm on the fun ride, but I genuinely did not notice I was wearing it, regardless of whether we were walking or at a flat out gallop (of course I was in control ).
You need to try them though, as we could not find one to fit my OH, who is only 5'4" and 8 stone. But then, you really should have any BP fitted properly.