Although not the biggest location, this library is pleasant, well-architected and designed, with an excellent kids section, extensive play areas including a rocket, good activities, a cafe area, good Internet access, natural light. It's the nicest library I've been in for children, and it's pretty solid for adults.
I can't claim to have looked over book selection extensively yet, but the TPL inter-branch system means that's not as important as it might be elsewhere.