Easy process from booking from beginning to end. My Guide Kevin was great, constant communication, knowledgeable, and fluent in English. Explained the process upfront and executed the plan as expected, meeting my pace and needs. Just one thing to be aware of: Klook states the airport is within the free pickup area; however, it is not, and you will have to pay an extra (albeit reasonable) fee for pickup and drop-off. Luckily, they will notify you prior with the amount so you are not surprised with extra fees when you show up. The Great Wall is a magnificent site, a must for first-time visitors; just be prepared with good walking sneakers, as the stairs can be uneven, narrow, and very steep. Who doesn't love pandas? You might as well try and catch one while you're here.