I am 5'7" and 250lbs. It took about 25 minutes to put the chair together. It was relatively easy but getting the screws into the back of the chair was tricky but once I got it then it was fine. The chair is super comfortable and fits me perfectly. It does have a little give when you lean back. Not a lot of makes me leary over the years how it will hold up. I will update in 6 months to see how it is going. I really like this chair and I cannot express enough just how comfortable it is. It does have good back support. I don't plan on putting too much weight on the arms as those are plastic and wobble a little. The screws are tight and it is snug but you can tell the wobble is just the plastic. Overall I really like it.
I was looking for a big chare just because I like to feel comfortable. This is the one is that I like. It is hard to say for how long it will for but I am happy with my purchase as of today.