I often do a variety of different reps 15,10,5 8x4 and strip sets.
I always train with a partner so I can lift as heavy as I can possibly go for the low rep sets, for instance for the 15,10,5 the 5 should be with a weight you can only do about 1 rep with, so if I can do 1 or so reps with 220lbs on the bench my partner will just take that little bit more weight off each time so I can get the full 5 reps out, so I'm always lifting the max I can on that final set. It can go for anything really, if you are about to fail to get the full number of reps out, someone can just help you a little so you complete the set. You can grow much faster this way if you are constantly pushing to the limit.
I always train with a partner so I can lift as heavy as I can possibly go for the low rep sets, for instance for the 15,10,5 the 5 should be with a weight you can only do about 1 rep with, so if I can do 1 or so reps with 220lbs on the bench my partner will just take that little bit more weight off each time so I can get the full 5 reps out, so I'm always lifting the max I can on that final set. It can go for anything really, if you are about to fail to get the full number of reps out, someone can just help you a little so you complete the set. You can grow much faster this way if you are constantly pushing to the limit.