I've raised chicks both ways, and definitely prefer to let the hen do it. The only drawback for me is that they're not handled so much and are more skittish of people.
I keep them apart from the flock for a while, giving them a shelter to lock them into for the night and letting them free range during the day. They stick really close to mama.
I put out the medicated chick feed and she eats it, too. If the other flock could get to it, they'd prefer it, so I don't like to put it where they can get to it.
They can go through the fence slats to where the rest of the flock is, and will once in a while. Once they do it more regularly, I put mama in there and leave them all together. That's after a few weeks.
I try to put the chick feed in a feeder under a board that they can get to but the larger hens are too big to get to.
It's a lot less work for me, and I don't have to worry about the electricity going out in a storm.
bethanyrae