i think the people posting against going to failure are not backing their statement up with facts.
fact:
those following the westside principals closely are constantly going to failure on max effort day whether they realize it or not.
louie says always try for a PR unless you KNOW you are not going to make it before the lift. sometimes you will get it, sometimes you wont, but the important thing is to keep pushing. well this IS definitely to failure folks. it just took one rep to get there, not 15-20. if you never went to failure, you never really tested your max did you?
fact:
regarding bodybuilders tearing things up really badly making them bigger, this is untrue. if you 'tear' something, it will NOT heal in time for the next workout nor will it make you bigger. that is called an injury.
opinion
I think injury is caused in powerlifting not because of going to failure via the repetition method, but because of the types of weights employed while using this method.
Consider this scenario. A 500 lb bencher could probably do a zillion sets of 135 lbs. In fact, he can train to failure using 135 and doing 50+ reps. Is it going to injure him that day??? I doubt it. 135 is not enough weight to do this, no matter how many reps he does.
However, now lets take that 500 lb bencher and have him sling 315 around for sets to failure. He has a much more likely chance of injury if he continues to failure set after set. Why? Well, every set his form will get sloppier. Sloppier form at 135 is probably not going to do any damage. Sloppier form at 315 can (and probably will do damage), especially if repeated often.
So what are my points?
Going to failure is NOT just a tool to get bigger.
Going to failure with low reps is often employed successfully by powerlifters to get stronger and bigger.
Tons of reps with heavier weights is probably a bad idea because you sacrifice form and are more likely to induce injury, especially over time, and especially in the compound lifts.
Going to failure with lighter weights and using the repetition method is also a valid training tool for a powerlifter. It is another way to stimulate growth.
/irish