Things I love:
The size of our coops. They are both big enough for 40 chickens each.
One has a removable wall that can separate new flock members so they can see each other, but cannot fight. I can move it myself.
Our rain barrel with a hose run into the coop for easy water fill ups.
The outside entrance to the run.
The new sand (so far).
The screen door outside of the regular door. It faces west and gets a nice breeze nearly all day long.
Things I wish I would have done differently:
I hate our feed and watering system. They poop in both all of the time, so I'm constantly cleaning them out. I'm working on a different plan now and switching to pvc feeders, it just takes a lot of the ones that I have, and I'm trying to figure out a way to feed more at one time. If my chickens would figure out the nipple waterers, I would switch to them, but so far, none have figured out the rabbit waterer, so I hate to try to make the switch in 90 degree weather.
I do not like the exposed braces. They roost all over, instead of using their nice roosts, this puts them right up against the hardware cloth windows, and I don't really like that. It's going to get covered in plywood one of these days I hope, so they will be forced to roost where I want them to. We are also thinking of putting an attic fan in to draw out heat and moisture and make for better circulation in the coop on these hot, muggy days.
I would have made a closet or storage area for their feed, meds, etc. Right now they just sit in corner.
I do wish I would have made the initial run bigger. We spend every weekend increasing the size because I want there to be grass in there at all times. They do get to free range, but only when I'm home and both coops share the same run. After a raccon issue I had to shrink the run down so I could cover the entire thing securely. I ran out of panels so now I'm trying new ideas and don't like any of them.
I wish the chicken door to the run was better thought out. Right now the ramp pulls up and wedges behind the edge of a panel, and lifting a panel that weighs over 100 lbs is just no fun.