I'm an AT through hiker and participate in adventure challenges. I've always used a weighted vest and sometimes even a backpack but the load has always screwed up and uncomfortable. I'm prepping for the Pacific Crest trail and this thing has been so much better for me. Days I can't get out and hike, I can get on my treadmill, set my incline, strap on my ruck trainer and have at it. Completed a 31mile ruck last weekend with it carrying 40lbs. I attribute it partially to the FNG's ruck trainer. I knew how the straps would feel and how to adjust and it's super simple to set up and go. If you're serious about your hiking or training for SFAS, this is a no-brainer. I can say that because I've been in the Army and have been a long-haul hiker for 26yrs and I've tried every gimmick and tool I can find that can save weight, space and help improve my training and reduce risk of injury.