Hello, I first saw the tank M1 on a video from Toes Over Knees Guy after doing some research, I was able to purchase the original tank M1 as it got discontinued and was like $250 dollars cheaper. Shipping time was a little long, but that's what amazon has done to us, thinking we should receive everything super fast. Anyway, I have been using the sled for a month now and I have to say that I really enjoy it and I am super glad I did get it at that price. It is made with quality material, it looks and feels great. Way worth the money. With little time and four kids, I push for 100 ft then I pull it walking backwards for 100ft. Do that for 20-30 minutes every day. Great machine, its just the work you put in makes your body and this Sled makes you stronger and faster! I cycle on the weekends and doing the sled gets me into zone 2,3,and 4 helping my aerobic conditioning and overall lower body strength. Highly recommended.