This is the best store in the area for runners. They not only have a friendly and very knowledgeable staff, they offer many training programs as well as weekly track and road workouts. The store frequently gives back to the running community and general community by hosting events such as this weekend's food drive which will benefit the Greater Pittsburgh Food Bank.
While some are listing the store as pricey, I regularly find true bargains on sale items. Yesterday, I bought $55 Nike shorts which were on sale for $25! They also have something like a frequent buyer program that saves me $30 or so a year. You should expect to pay a bit more for quality items but it is wise to do so as these items are better for you and last longer.