It's definitely worth a visit; it's truly breathtaking. Every detail is meticulously crafted, completely contrary to online claims of shoddy workmanship. The 600-meter-long mural is said to have taken 27 years to paint. I didn't spend the entire fourth-floor Tibetan cultural mural exhibition, but I saw the other exhibits. The guided tours all use headphones, but the volume is extremely low, making it difficult to hear the explanations.
If you're just rushing through, don't bother renting a guided tour. However, if you want to take your time and spend an afternoon at each exhibit, it's well worth it.