I own both models and highly recommend the Ultra Heavy Duty as it really is built quite a bit stronger and worth the extra money. You can stack the wood higher than the end rails and I was able to get a full cord on each of my 12 footers. I like these better than building wood shed/pallet shed, as the air really gets through there and you deal with a lot less mice as they have less shelter/protection from the hawks. My pallet wood shed is constantly infested with mice and these help avoid that as well as neatly stacking & drying your firewood. These are also so attractive that you dont mind having it in your driveway or on your porch. These racks will last a long time and extra covers can be purchased seperately as they likley will only last 3-4 years. Overall, highly recommended.