You can find some great pieces from high quality labels in the second hand section at the back, and for very good prices. All of the clothes are in very good condition, they seem to have tighter standards for what they resell than other second hand places.
I've found some beautiful pieces here some days. It's hit or miss, but definitely worth giving a try.
The rest of the store (non-second hand) is very pricey and not always great quality.
So I would head straight to the back of the store if I were you!