Unboxing and assembling the rack was simple. However, the instructions are a little confusing at first. The rack itself once together seems sturdy and ok. The rack rails are a little more challenging to install. You have to measure 5.5 Cm or 7.5 Cm (If you plan to install the door) and keep then rails in the correct spot. There are no guide holes for the screws, so you must keep them straight, level and in the correct measurement. My recommendation is to use wood 2 clamps and a Square to clamp the rails at the correct measurement and in place, then screw the top and bottom screws first.
If you plan to add the door, it is best to get the door with the purchase because the measurement (5.5cm) covers the holes for the door. To add the door in the future, you have to move the rails to 7.5 Cm, which will then expose the screw holes you made for the fist measurement without the door. Other than that I like the way this rack looks in my studio and the rack rails work great with the ability to place the audio gear where I want them. I like a small space between each piece for air flow.