Takes the stress off your back and shouldersI love the width of the wheel- able to manipulate, but not wobbly. I also like being able to grip and support my forearms. My abs are screaming :)Me preocupaba la calidad ya había tenido una que se daño a la semana. Esta nueva es de mejor calidad resiste mi peso.Awesome qualityI have an ab roller like most out there - a wheel with a handle sticking out to either side. I have never once felt safe nor comfortable on it mainly because it feels like the handles are going to snap in two on every roll. I stopped using it. When I saw this Quvvrev Ab Roller Wheel I decided to grab it 1. because it looks substantial compared to most of the others I've seen or the one I use, and 2. the elbow support looks like it would take the weight off the handle and give me a more secure, safe roll. I was right on both counts and am happy to have it.1. It comes in a good box that would make for a good gift for yourself or someone else.2. It comes assembled. Nothing to put together so you don't feel like if you do it wrong you're risking your safety.3. There are two round pads for your knees. Often the included knee pad is a single and usually smaller/smallish thing that makes it uncomfortable to kneel on and won't stay in place. The two means it works where I want to place my knees, and they stay in place (on carpet) well. I do wish they were a bit thicker - we have thin carpet on a cement floor - but it's alright. If they were twice as thick it would be nicer.4. The roller is excellent. First time out I was happy to have my arms resting, giving me a supportive and safe feeling, but also really comfortable. I'm a shorter guy at 5'5" so my reach is also shorter, but I have no issue placing and reaching my arms in the elbow supports and gripping the handles. I feel like I am completely in control of each roll.5. Every roll is controlled, can go in multiple directions to work various parts of the core, and I never once feel like something is going to break. The roll itself is smooth and works my whole core, while giving the arms a workout, yet still places the majority of effort into the core muscles.Overall I am thrilled with this Quvvrev Ab Roller Wheel and so glad I took the chance. I am back to not only use an ab roller, which I found before worked for me, but already working myself up and feeling great about the experience.This ab roller is fantastic. I work out almost every day and sometimes get sore from calisthenics, so this is great for working out my abs. To make it easier and more controlled, you place your forearms on the sides. After a few uses, it appears to be of high quality.The only drawback is that going left or right to work different parts of your abs is a little more difficult because the wheel is not curved like my other ab rollers. The handles are comfortable to hold and do not hurt your hands after 10 or 20 repetitions.I highly recommend this product.I've tried so many various kinds of ab and core exercise machines in my life. Everything from traditional ab-rollers to the ab dolly, and everything in between. This one blows the others out of the water. It supports your elbows, which is my gripe with most other ab products, and it gives you a sturdy and stable handle to hold onto and really put your weight on as you roll back and forth. The curved shape of the handle is very similar to the shape of the grips on an ab dolly, if you've ever used one of those. But where the ab dolly uses those crummy wheels that you also see on cheap office chairs that get stuck in one position and you have to really force to get to move in all directions, this 4D ab roller can truly move in any direction with no friction whatsoever. Whichever way you want to move this thing, it's capable.The build quality is also extremely impressive. So many workout products like this seem to be made very cheaply, almost as if they're disposable. But this is going to last years and years I can tell. It's got good heft without being too heavy. Just enough that you can trust it when you're putting your entire weight onto it.If you don't have a yoga mat or foam pad to put your knees on when working out with this device, no worries, you can use the included foam discs and just rest your knees right on top of them. A great little addition that shows a lot of respect for the customer. They could've easily just have forced you to buy a separate product, but now you get everything you could possibly need to use this product right out of the box.Love it! It's totally changed my core workouts.I purchased an ab roller when they 1st came out but didnt really stick to it as it was difficult having to balance the body from the wrist and the wheels were narrow.Pros: However, this new one has wider wheels for more stability, & has a place to rest your elbows making it much easier to work with. This version has a knee mat helps immensive.Con:The elbow frame was initially loose and connected by one screw. I tightened it but long term may be an issue.The wheel feels slightly soft polycarbonate material, but is not as soft rubbery as I would like.Overall, this is a good ab roller for working out.