If they only want to watch Blu-Ray movies than for sure buy a stand-alone Blu-Ray player since they are MUCH more quiet.
If you want to know the quality difference between the PS3 and a stand-alone Blu-Ray player, than the PS3 is doing it's job. In picture quality there hardly will be a difference, about audio quality i don't know. If you want to see a difference in picture quality, than maybe the high-end Blu-Ray players are better, but don't expect wonders.







