Positive reviews for Planet Fitness rave about the spaciousness of the fitness center and the friendly, professional, and helpful staff. Customers appreciate the well-maintained environment and the cleanliness of the equipment. Many also mention the family-friendly atmosphere and how it is a great place for beginners or those starting their fitness journey. The black card membership is highly valued and offers more benefits compared to other gyms. Overall, customers love Planet Fitness for its welcoming environment, excellent customer service, and cleanliness.