I was about to start a similar thread about Kilmorie and Dalmain nurseries, I'm afraid I don't know about Perrymount but have thoughts on Kilmorie.
We have a place at both and I have visited Kilmorie twice and Dalmain once (and this was as part of a whole school visit so nursery tour was very brief). I got a great feel from Kilmorie amd was impressed by the teacher and the assistant I met. Dalmain classroom and playground both looked nice and well-equipped but I didn't see the children doing free flow play and instinctively the space seemed more formal and less child-centred. Free flow play (which is a big priority for me) seemed to work really well at Kilmorie and this was in part due to the outside/inside layout of the classroom and the outside space. My instinct tells me Kilmorie will be better for my son (and he is more likely to get a place in, and therefore transition to, reception there) but I am going to visit Dalmain again soon to be sure.
Sorry to derail from Perrymount but am interested in any thoughts on that school too as we are v close by and may put it as an option for reception.