Spring we still have one in L's room and I don't see that changing any time soon. DD was about 3 when we took hers out, but that was only because we needed it for L and we were sleeping in the room next to her so could hear her very easily anyway. We are now at the back of the house, the kids at the front.

You may remember that we had a horrible incident last year when I went to get L up and his cot was covered in vomit He'd been sick overnight and we hadn't heard him because the monitor wasn't turned up. I made myself sick with guilt thinking he'd been that ill and had been calling for us and we didn't hear him I have no way of knowing that's what happened, but now I am vigilant in making sure his monitor is up before I go to sleep. It's on DH's side (D's is on my side) and he sometimes forgets. L can be noisy too but we have it at a level where if he were to cry or call out we'd hear it, but not so loud that he disturbs our sleep.

Having said allll that though, if you are confident you can hear him if he needs you, then I can't see the harm in turning it off.