I've never really done them before. Well, once or twice but not enough to really gain anything from them.

Anyone do them and have good carryover to their back squat, or is this something that would be better left as a higher rep exercise (8-15 or so)? Thanks.

Front Squat for high reps are no good. Upper back becomes the limiting factor instead of leg strength.

They have enormous carry over for me, in fact, front squats and deadlifts are the only squat assistance I do. 

 But I do squat ATG and only do  400 @ 190...

Cheers!

What previous poster said. Trying to do heavy front squats for more than 5 reps is IMHO a bad idea. You'll start leaning forward more and more and eventually either place way too much stress on your lower back or dump the bar. I like either 5x5 or 5x3 (5 sets of 3 reps) to rack up the volume.

 They're a great *assistance* exercise for PL, and are certainly less stressful than the back squat.

It's funny.  Mike has me do sets of 10 and 12 now and then.  I used to think that going over 5 reps in the front squat didn't work, until I actually tried it.  I remember somebody on another board posted about a question about doing 20 rep front squats, got laughed at, told it was impossible.  A few months later, he posted video of himself doing 20x315 in the front squat.  So I'm not sure that doing high rep front squats is bad, impossible, or a bad idea.

They definitely work the upper back.  They're hard.  But you also need that strong upper back for back squats, and this is a great way to work on it in your accumulation phases.

I suppose the ubiquitous answer of "it depends" works well here too.

I'd say it depends on you as a lifter (your strengths and weaknesses), as well as your training objective.  It's a good alternative exercise to train your back if you don't have a SSB.  Actually, between Front Squats and Zercher lifts, you can train the upper erectors pretty hard.  If you're trying to train your legs (usually quads), I can see where keeping the reps down can help some folks.  But on the other hand, if your upper back is what is limiting you from high reps, it might limit you on low reps too.

For me, if I think of any reason to keep the reps down on front squats, it has more to do with breathing and bar position.  For me, it's very difficult to breathe on front squat.  And if I get past that, I tend to drop my elbows as I fatigue, causing the bar to slide down.  That is what usually limits me on front squats, but regardless of the rep count.