I am not a fan of sand. In 2012 I decided to switch to sand in my coop. Within the next few months, 5 chickens died. They were young, between one and two years old. No, I didn't send them away for necropsies so I don't know why they died, however, nothing else changed except for the sand. So was it something to do with the sand?
Then when winter came and the whole thing became a giant litter box. Yes, we have poop boards, but during the bad weather when they didn't want to go outside, they staying inside and pooped all over the sand. I would end up on my hands and knees trying to scoop it out as best I could. It was so gross. I eventually covered the sand with pine shavings.
We are in the process of building a new coop and we will not put sand in the new coop ever again. This is just my experience and a lot of people will disagree with me, but that is ok. I don't like it and I won't use it ever again.