Hi Grooney,
I live in the Gallops, and much prefer to use the Londis in Sandyford Hall than the Spar for my quick buys. There's an unbelievable amount of trackies hanging around Spar, but to be fair, i've never seen them cause any trouble. (Although, since the new chippy opened by Londis, they've been spreading to there as well - is it a chippy thing???!)
The pub there, the Gallops, is one of a very few itinerent friendly pubs in dublin, and they can be boisterous on saturday and sunday afternoons when lamped, but to be fair again, never seen any trouble.. Nevere stepped foot inside the place though..
Anyway, that estate has never ever impacted on me, and I absolutely love the area, can't speak highly enough of it. Even though the prices are high, it still is one of the cheaper areas in South Dublin. A new Dunnes and shopping centre is going in behind Spar there, and the extended Luas will be on your doorstep. Cannot go wrong IMHO.