My parents and I had a 7.5hr layover in Beijing so this was an excellent opportunity to visit the Great Wall of China. Now it was just a matter of choosing a company to go with. And believe me I made a huge research, reading hundreds of reviews, comparing prices, trying to find cheaper solutions, (but unless you speak Chinese, I would not recommend you taking a risk and going there on your own. You would need to take a taxi (drivers only speak chinese) as there are no regular busses from the airport and going to Beijing would cost you lot of precious time..) So I came across this company and it was by far the winner. Not only they have competitive prices, the customer service is just amazing. First of all they always replied to me within 5 minutes, second of all they are very very helpful - As We were travelling from warm country to warm country, we didn't want to take any winter clothes but they provided us with winter jackets, which saved us from having to pack and carry around heavy and space taking items in our luggage. Also they are very flexible and they joined us with another person who was also interested in visiting the Great Wall during the same time, which brought the price for all of us lower. They are also very organized and experienced, so there is no chance you'll miss the plane. They really count on everything (queues in immigration or rush hours in Beijing). So to sum up this was a fantastic, organized, stress-free, dream come true trip