They are many times easier than chickens to raise and get fantastic, highly nutritious, eggs from. I am considering making one of my chicken runs into a Coturnix quail enclosure and getting rid of the chickens.
Very little maintainence and because they are wild they need less care than a chicken does. I have not seen the problems with disease and the longer waiting times for eggs or any flightiness. I hatched my Coturnix 6 weeks ago, and they almost always all hatch, and I gave away 30 of them to drop my count to 32. I then gave away the remainder of the roosters, ten more, keeping 2 for my 15 remaining hens.
They hatched 6 weeks ago this Saturday and I got my first eggs today. Starting next week I will be getting 15 eggs everyday and if I want to I can have another 50 Coturnix in 3 weeks. These things put rabbits to shame with their breeding.
If you go into the larger quail for meat purposes, you will find that the work is much more similar to chicken work and more difficult.
Good Luck