4ea of the M6x20mm screws for the armrest were too short IMHO as they only engaged a couple of threads in a high load location because of plastic mounting surface distortion that increased the distance to the threaded inserts. I made a trip to Lowes to get a pkg of 6ea M6x35mm for <$2 and also added a 1/4" washer for support in plastic slots (1st pic). Not a big deal to me, just an inconvenience as store was only 5 miles away. 2ea of the 3ea "back" attachment M8 screws (2nd pic) would not thread into their location without undue resistance IMHO. They may have threaded in completely, but I was concerned that they may strip the allen head socket screws if forced and decided to use a M8 tap to chase/cut threads through holes as a stripped allen is difficult to remove/replace. Try to insert them without "back" in place before install just to see if they will install completely, or buy hex head bolts of same length? May just have been my chair, but it seems the plastic clearance holes were a bit too small? I had to (IMHO) file the bolt holes in the legs to get them to rotate slightly so that axis of the casters would be closer to vertical so that they would pivot more freely about their axis in all directions to make the chair easier to move, but I'm extremely picky. I did not care for the upper neck support because it made it difficult to tilt my head back to sallow my meds, so I removed it. Waiting for my "armrest cushions" to arrive for install after which I'm sure I'll be happy with the chair as it is comfortable, maneuverable, and quiet, but highly recommend M6 x 35mm screws for armrest.I'm 230 pounds and this didn't last long. I broke it at the seat to back rest corner. It's not super comfy either. I'm also large so... This would make a good kids chair. It adjusts super low and a lighter weighted person won't squeeze the cushion all the way down. It also reclines a little bit. Plus, when they break it you're not out a whole lot of money. The leather or pleather or whatever it was made of did not have a bad feel and looked pretty sturdy and had a nice feel. Assembly was easy and quick with ok instructions. I would recommend an arm rest to add the extra support for larger fellas like myself.Great design for work. Relieved my sore joints from sitting all day. It’s surprisingly solid and well designed. This is a great buy!Not comfortable if you have to sit in for very long.This is a nice leather chair. I bought it for my sewing room and it fits nicely under the sewing machine area. I gave it 4 stars because the lever to raise and lower the chair is very loose but it does work. Don't know if it's supposed to be that way.This is a sturdy, simple chair, which is why it was ordered. Had to get some screws for it locally, seller covered that though. It takes up much less space than the armed chair it replaced, and is just as good for the location where it is used.This chair can be used at your kitchen table as well as your work station. It looks good and will last for years. The chair is very easy to assemble. The seat and back are one piece; so all you need to do is put the wheels in place on the base and tap them in their socket with a hammer. If you place a small object between the wheel rollers--like a narrow block of wood--and lightly tap the block, the wheel slides into the socket.Very easy to assemble and a very nice chair for my sewing room......comfortable so far...it will be used a lot. Would have given 5 stars except haven't had long enough ......hope it holds up I really like it