I've used them probably 5 times, couple US, three in Europe. No issues but definitely read the reviews that are posted. Not all tours are equal. Also, as stated above, they are just a booking agent so keep that in mind. For one tour that went to Stonehenge, I looked at Get Your Guide then just google tours to Stonehenge and found the company these used (or at least think I did). Saved probably 30% on it by doing it but also researched the reviews of the actual tour company.