Oh and to answer your question, in my opinion if your rep range is rarely very low and one rep maxes I personally would never use a belt. In the last 3 months I've stopped using belts just of curiosity to see what impact it has on my lifts and my body. I guess I'm one of those few people who would rather try something instead of read about it to find the answer. If your pushing out one-rep maxes and want to compete then I'd suggest a belt, but remember that the belt isn't to so much save your back, then as it is to create additional abdominal pressure to try and get your max squat or deadlift.
Correct me if I'm wrong other members