Where was StarTech's quality control? Out to lunch?So disappointed as I had high hopes for this rackmount unit. I had a unique need for a side-mounted, wall-mounted 4-post rack. This was the only product I could find that seemed to fit the bill. Unfortunately, quality control at StarTech appears to be sorely lacking.First off, this is not clear in the product description, but the rack arrives fully assembled in a very large box. This quite surprised me as 99% of the time devices like this are flat-packed and the manufacturer expects the end user to assemble the device. This saves a lot of money on shipping for the manufacturer and reseller. I'll say in retrospect, it would have been better if Startech sold this unit flat-packed as it might have avoided the significant issue I ran into.As it arrives, the parts of the unit are riveted together. They only fit one way. There are no adjustments. This has the disadvantage for all parties whereby when a unit is damaged significantly - as mine was - there is no choice but to return it.It's difficult to tell in the photo showing the full frame, but my entire unit was twisted. It's as if someone built it and then picked it up and mangled it in 3 axes simultaneously. I've never seen anything like this with a device that clearly is designed to fit together only one way and feels very sturdy when you pick it up and move it around.The entire unit weighs almost 50 pounds, so it is quite heavy. This is another disadvantage for a wall-mount unit, as it is very awkward to position the unit for installation given its weight and girth. Preferably a 2-person job (perhaps 3). And again, an area where a modular, flat-pack design would have made more sense.My main issue however, was the significant warping of the unit. I had a particular need to install a 4-post device with rails. That meant right away I knew this rack was not going to work. If you only have 2-post equipment installation requirements and receive a twisted rack, you may be willing to live with the inconvenience of a non-square rack unit. However, in my case - and if you are going to install any 4-post equipment, especially with rails - this is going to be a problem. If you're planning to use rails, don't even think about trying it out before you return the unit. Your rails will get twisted and at the very least, over time the strain will warp the rails. No thank you.There was also a significant dent in one corner. Now, I'm not generally picky about defects like that, but first, I had this issue of a warped rack to begin with; and secondly it caused me to wonder if the cause of the warping was someone using this rack like a soccer ball and if it was perhaps thrown around the factory floor after assembly. The dent is pronounced, as if someone hit it with a hammer. It not only defaced the corner, but flattened it. This is a tough rack and seems very sturdy, meaning something really hard must have hit that corner.EDIT 12.05.2021: Upgraded 3 stars after Amazon swapped out my severely warped 1st rack with a 2nd at no charge, and the replacement rack is perfectly square!I do want to warn anyone contemplating installing equipment requiring rails that while this is a 4-post rack, the rackmount screw holes (squares) are recessed about 1/2" into the rack frame. Thus, some rail supports are just a tad too wide to work with this rack (ask me how I know... lol).With a typical floor mount or wheeled rack, you're not likely to run into this problem, but since this rack is designed for wall mounting, the vertical sides are reinforced. This is great from a stability perspective (presuming your entire rack is not warped to begin with), but it's not helpful when you intend to install after-market parts such as rack rails. When I installed a set of Rosewill rack rails to mount my RSV-L4500 chassis, after assembling the rail supports and sliders, I discovered the clearance width was short by 1/4". The culprit turned out to be the fact the Rosewill rail mount ears were pushed inward by 1/8" on either side, because the edge of the ears is 1/8" wider than the wrap-around clearance of the rack. It's a bit difficult to visualize from my explanation, but if you take a close look at the business end of the rack face - where you'd attach M6 bolts into your square nuts - you'll see it's not very wide on either side before you hit the edge support of the rack.Note, this also means any unusually wide rack handles also won't fit and you may need extra long M6 bolts if you want them bolted well to keep them in place. At this point, I'm left with a few options, none of which are great: 1) don't use a 4-post rail to support the weight of this beast of a case; 2) hire a metal shop to trim the edge off the rack mounts if there's enough clearance; or 3) let the chassis hang and hope for the best. Third option is a bad idea IMHO considering my chassis will weigh close to 60 lbs. by the time it's filled with HDDs.