This is a large location with TONS of clothing. Be warned, 1/2 off Friday's are very busy and the line up sometimes stretches to the back of the store. It is conveniently located in Greenwin Square, which does have underground parking if you are driving. This is also very close to Sherbourne subway station.
I like to shop here for books and kitchen gadgets. I picked up a great stock pot for only $4 (I priced the same pot new and it was $25) and have used it many, many times. There are many good finds, but like any store of this type, you really need to go often and spend a bit of time browsing.
They do a really good auction here as well and the quality of auction items is very good.
The store is always busy, always filled with interesting locals from the neighborhood (like me) and always great value. Buying second hand is a good way to help the environment too!