So this product comes with a wheel on the bottom that allows your laptop to rotate. I suspect my 2015 MacBook Air is too light because it didn't actually work and instead rocked my laptop back and forth while typing because the wheel is in the center and there is dead space on the rest of the base. It was very annoying. But after unscrewing the steering wheel below and changing the anti-slip discs from the steering wheel to a rectangular base, I liked it! Really improves my posture and makes working from home all day easier.