We have taken 4 tours with SDT, and all were excellent. Our trip this year although completely paid for was then cancelled at least partly because of Corvid, and yet we received a full refund! We had a trip to Ireland where the SDT representative was not that knowledgeable, but the bus driver made up for her shortcomings! On a different trip to Copper Canyon, our SDT representative was really too young and inexperienced to be given the responsibility of handling the tour, but in this case our local guide was absolutely fantastic and we had a most interesting and successful tour!