Stayed in the houses on the complex last summer - all in the family were very happy and satisfied.
Swimming pool was clean, and various activities organised througout the week to act as fall back when (more so than if) the weather wasn't so favourable.
Kids camp went down well with our gang - 7, 6 and 3.
Noise didn't come into it as the self-catering (houses and apartments) are somewhat away from the main road.
When we stayed there many of the apartments weren't yet finished, so I'd be a wee bit concerned that it would be too busy !! There's quite a lot of accomodation on site, and whilst we did use it as a base for other activities (muckross would be very recommended on a nice day) if you were confined to the site for whatever reason it might be quite packed to use the facilities.
All in all though a good spot.