Chairs can be awful for bigger people like myself, especially anything with arms. They squeeze your legs together uncomfortably and make you end up balancing on the very edge but not this office chair! The seat is wideset and when assembling you can bring the arms in closer or further apart. They're also height adjustable with little buttons you push in to pull up or down. The cushion is comfortable and the back is breathable mesh, making for a nice experience for those times you'll be sitting for long periods.
Assembly is pretty easy. There's a few screws that you put together with an Allen wrench (all provided) and a simple sheet of instructions. I had mine put together in maybe ten minutes. That said this chair and all its parts are heavy. Not a bad thing considering the weight it can hold but definitely have someone help you put it together if you can.
The only complaint I have, and it's small, is that the lumbar part doesn't really do much because it doesn't come out far enough to even touch my back. Not sure if it's because I'm short or it just doesn't push out far enough. Either way, not a big deal for me but maybe for some.
Great chair, especially for us bigger people.