For the most part, i believe in a moderately high (10 rep) range when doing legs, i go as low as 6 with some exercises. When squatting, tiz 2 work sets of 10 reps, then usually a heavy set til failure, and if i'm feeling frisky, i'll throw in a set of 20 reppers. My single leg leg-presses i use a 6 rep range and i also use a 6 rep range for my SLDL. I do the good mornings on leg day too, after the SLDL, but most people don't want that much stress on the low back.