My best friend and I are novice climbers from Tennessee, and we wanted to climb Devils Tower. Jeff took us through a great introductory course at Custer State Park, and slowly built us up. The next day, we were able to summit the tower. Jeff is incredibly knowledgeable, safe, and fun to be around. As you can imagine, this climb is a stressful event, but Jeff kept us motivated. I could not recommend Sylvan Rocks more. Fantastic experience. I will likely be back with my family again.