This is a 6km hike to the waterfalls and back, as well as a steep descent to actually see the waterfalls. Most of the info I could find about the trail indicated this was an easy hike. The descent to the waterfalls and subsequent climb back up are anything but. It didn't help that we did the hike on the hottest day of the year so far. It was 33°C in Fotinovo and 40°C in Plovdiv.
The waterfalls were interesting and worth the effort, but not exceptionally so. Maybe they are more imposing in the spring.