Although they are more expensive, these are safe and guaranteed tickets which can be bought on dates when the official tickets are sold out, especially closer to your visit date. We received the online tickets a day before our entry. Entrance was crowded but the staff are helpful to guide you to your designated ticket queue line. Inside the galleria was mildly crowded. The Michelangelo David statue was magnificent and there is ample space for you to admire and take pictures. Overall I would recommend this place.