Bests & Worsts Reviews from Amazon

This chair is built like a TANK. I'm a big guy and the most common reason I have to replace a chair is because the side pieces get stripped or break. I usually buy chairs with the right weight rating so it's never the piston that gives but usually the castors or side screws. Well the base of this chair is SUPER sturdy. I included a picture of the base. It's all metal that is attached with bolts. There is no plastic!!! The castors are plastic but they feel "durable" so I'm not really that worried. Getting the castors into their slots was a bit of a pain but I just wiggled them back and forth a bit and they eventually went in. One kind of annoying part during assembly was the cloth on the back piece was put on without any holes where the back screws are supposed to go in, so I felt around with my finger and found the holes then used the Allen wrench to punch holes in the cloth so I could find the holes when assembling the back brace. If you're like me (with other chairs in the past) and looking for replacement bolt specifications and the instructions don't include them I'll take notes here: The screw package number was "OC-BT491/BM-BT502" (Not sure if that's useful but I'm writing it down :) ) "X8" M6 x 38mm x 4 pcs (bolts for piece attaching back to bottom pieces) "Z1" M6 x 12mm x 10 pcs (bolts for attaching wheel base pieces) "W7" M8 x 50mm x 4 pcs (bolts used to attach arm rests to top piece (these were the screws in other chairs I usually had to replace later) "W6" M8 x 38mm x 6 pcs (2 used for attaching front part of bottom lifting mechanism, 4 used for attaching plate to back piece) "G" 4 x Plastic Caps "O4" 4 x Washers They also included 1 extra of each bolt and a washer in the section called "Spare Parts". Overall I love this chair so far. After assembly there's not even the slightest bit of wiggle or creaking like other chairs ( hopefully that means it's less likely that the bolts will strip out like my last chair) and the seat is super comfy. The vibration is kind of cool but it's not game changing. It's nice, but it's not a large vibration. I'd compare it to those vibrating pillows you can buy in the airport for traveling. Overall I'm extremely satisfied with my purchase :) Oh! one more thing, when assembling the chair make sure to follow the instructions where it says to not fully tighten the side bolts until everything is in place, otherwise it'll look like the sides don't align, when in fact they do, you just got to make sure to only minimally attach everything first then do the final tightening :) I wish Amazon did that "remind me in x months for a follow-up review" lol. I'm so far VERY satisfied with this chair :)