I was surprised that I don't notice any smell! I was all for having the babies out in the shed that is literally 5 feet from my kitchen door, but then I SAW them... oh and they are so tiny so yep, moved the brooder in right next to me in the office. I love the sound of their little peeping.
I have been using a THICK bed of pine pellets and the ones that get soiled, break apart and filter down to the bottom. It is working really well for us, and my DH is super sensitive to smells so I was quite surprised that he is even fine with it. I have only cleaned ours out to the bottom of the brooder once last week when they were 3 Weeks old. I have 8 baby chicks. So that is not bad at all.