I like leg presses after my sq's,and always do high reps with them.What i like about them is that you can go and go untill you tire,lock your legs,take some breaths,and go some more.Sometimes,i don't want to stop.You hit failure,but that 10 second break allows you to hit 2-4 more,and then again and again.I would never use as a staple though.Or any machine for that matter.
Branch Warren does some high ass reps,up to 100.He said though,if he does lower reps with heavier wight,his legs grow too fast for upper body.Tom Platz also did some high rep sq's.20 minutes straight one day,then had to be rushed to the hospital for oxygen deprivation.He also did lunges back and forth on a football field,with 225 on his back.Charles Glass said that one day,higher than 20 rep sq's may be needed to advance to the next level.So the "proof" is ou their.I have decided that one day,long from now,i will start counting minutes instead of reps while sq'ing,to bust through plataues.
Any and all free weight movements kill any and all machines for strength and growth.Pump wise,is sometimes a different story.Gustavo Badell made some great improvements to his back.When asked what he started doing,he said going back to the basic free weight movements did it.Said he got lazy and went against his better judgement a few years ago and did a lot of machines.So don't be "that guy"The damn machine rapist.