It was pretty good! The flow of people at the site was very smooth, and before getting into the water, they briefly explained the swimming route. The guide initially said that if you got tired, you could rest, and verbally told us which areas we couldn't go into (because they were too deep). I thought it would be fine to just follow the guide, but he barely stopped, so if you don't keep up with him, you'll fall behind. You pretty much have to keep swimming until you reach a crevice where he'll take a photo for you, and then you'll loop back to another landing point. It's about a 1.5-hour swim with few breaks. Once you get out, they give you an energy bar and hot chocolate. The guide was very nice. If I had more stamina, I would have enjoyed it even more! Also, one of my companions had water get into their drysuit and was very cold halfway through the swim, so if possible, remember to bring an extra change of clothes and some cold medicine.