we've had ours (5) since last summer most days we get 5 egg without fail even when the dogs have been chasing them round the garden !
Garden has suffered tho 150ft x 18 ft of lawn completely stripped of grass ! they get 4-5 hrs of free roam in the garden a day.
You'll also find they are really nosey, given the chance they'll come in the house and explore !
We've found them before making there way upstairs when the back door has been left open.
They're not bothered about 2 big dogs loose in the garden ! or a 3 year old ! he's our best chicken chatcher !
Good luck you'll love them !