Terrific trail, a great way to spend a day in Arches. The arches themselves are obviously incredible, but honestly the trek through the fins is just as awesome. Some of the coolest, most unique geology I've had the privilege to see. We took the main trail in and primitive portion out - primitive trail definitely has the better hike through the fins, just not as many arches. Took us a while to do the loop, and it gets very hot out there in the afternoon, so take lots of water and snacks. Ran across someone having a really bad reaction to the heat on our way out and had to do some basic first aid until the rangers arrived - heat and dehydration are no joke, so go prepared!