I dare anyone who has ridden one of these to give it less than 5 stars. If you have fun riding a mountain bike, you will have an absolute blast riding a lightweight carbon fat bike. I have mine built up with Hed Big Deal wheels, Next SL cranks, a dropper post and Vanhelga tires. With a large frame the build comes in at under 25 pounds. I have a Santa Cruz Tallboy and my Echo climbs significantly easier than it. The wide footprint gives you more power to the ground and the tall tire pretty much morphs the 26" wheel into close to a 29er. I use the Echo on long steep gravel roads in Utah as well as smooth single track like the Bobsled.