I know it is a bit relative, but this movement is only for the very very strong in my opinion. I seriously doubt that many females out there could do this movement, at least not with full range reps.
Those rings are trying like Hell to run away from you and you have to hold your bodyweight up while trying to keep those rings from going all over the place. This is why they work so well, but also why they are so difficult.
If you weigh around 200 and cannot bench 300, be really really careful when starting these, I would definately not put your feet on the bench to start off, or you may tear a pec, dislocate a shoulder and do a monster face plant in pretty short order.
I did 3 sets of 10 the second time I did these and that was absolutely all there was. I knew I could not have done a 4th set. But if you are fairly advanced, I really think they can increase your stabilizer strength, and probably help you handle big weights more safely.
B.