This was a trip of a lifetime. We're from Houston, the terrain is flat and unremarkable. Utah is full of mountains, cliffs, rocks/boulders, it's amazing. Our great guide, Tyson, was from the area, very experienced and knew the trails like he owned them. He took us over trails that I would have been way to scared to try myself. He knew the capabilities of the machines and told us exactly how to handle them to conquer all of the obstacles. He was very excited for our accomplishments and jumped out regularly to take our pictures and video with our cell phones so we would have good mementos of the trip. We all had great times on this trip from Mad moose rentals and would highly recommend it to anyone else as long as you use a great guide like Tyson. We would have been lost in the dunes without him. I'm 6 ft 5 and weigh over 300 pounds and fit in the machine just fine. My sister-in-law who is 4 foot 10 and 100 lb fit just fine as well. I have a giant head so I did bring my own helmet. But they had a wide selection of helmets for other people. We rented turbo models they had less than 500 miles on each of them they ran great and we didn't have any issues. All the reviews on here about parts and having to pay for parts when a machine breaks down, if the customers were paying attention there are signs and written confirmation in the contract about customers are liable for parts up to a certain dollar amount. I asked Tyson our guide how to be careful and not break anything and he said if you drive the way I tell you to you should have no problems. So be careful when reading reviews alot of these people were on there own cruising and didn't have guides and for sure didn't read their contracts. Our experience was amazing and we would always recommend them.