Pros
The people are more than qualified, and very friendly. With few exceptions, everyone from entry-level to upper-management gets along great which creates a very productive atmosphere. With all the experience in-house, learning possibilities are rampant. For a very long time, Reading was the center of the WP power world, but the company has grown tremendously over the last decade. Those changes have drawbacks, but also create endless opportunities for the qualified and open-minded employee.
Cons
Location, location, location. If you're looking for the variety, competition and networking available in a large city, you won't find it in Reading. Many employees are "lifers" from the area, but they do manage to draw some fresh blood from the surrounding satellite universities and Philadelphia (although not always for long). Overall the quality of the people offsets the lack of quality in the area. Like most large companies, WP is a little top-heavy these days.