We always have a great time at SPAC, it's our favorite place for the family to attend a concert together. The family zone is great and the lawn is expansive making it easy to get away from the crowds as needed. Sound varies widely so move around a bit if it doesn't sound great where you setup at first.
Official family zone is great, staff is usually very accommodating. One of our favorites!
We've had good experiences here with the kids a few years in a row. They have had food trucks in the back cranking out fantastic food and you can sit on the sloped lawn in the back and soak in amazing views of Philly while listening to the music. Parking can be a little confusing and the neighborhood is a little sketch. Don't wander beyond the park itself in my opinion.
Very strict venue with limited tailgating (if any) and somewhat rude staff. They go so far as to setup a satellite police station on-site. Takes forever to get in and out of the venue if you don't time it well and leave early. Sound inside the venue is meh. Merriweather is the better option in the area for a show with kids!