RK Bridger does excellent work, and this Philly package is no different. The Schuylkill bridges are especially well-done - which is good, because there are a lot of them... This is a premium price for an MSFS add-on, but you do get a large number of bridges and the quality is excellent, so you are getting what you're paying for.
High quality models and well-blended with the base scenery. RK Bridger's work is a little on the pricey side, but you do get a very high level of quality for your money.
This does exactly what it promises: adds birds. And a lot of them, too. The only caveat: birds are not large compared to aircraft. It's hard to spot them unless you know what you are looking for, and have good eyesight. As such, this is a probably a more useful product for people who fly low & slow, or who fly helicopters.