I have 9 chickens and 2 of these boxes. Sure, everyone starts out with lofty plans of homemade eggboxes with trays and doors and whatnots.. We did too. And then we were weeks into building the coop and frankly we were feeling DONE. I found these on sale at Tractor Supply for $17.99 each and just went with it.
I'm glad I did, the girls like them a lot and it's easy to pull them off the wall, even with a chicken in it (you gotta get those broodies out there somehow..) I have only one stubborn bird who keeps laying her egg under the roosts, the others will wait patiently for their turn in the box. It's cute, when one of my birds went broody she kept occupying a box and the other girls would hop around impatiently, like a child waiting to use the bathroom.
They're a little awkward to get into, they may be better suited for slightly smaller chickens, but it's never a real issue for the girls. They make it work.