I never write bad reviews, but this stand is just so bad that i must write something :-D
Ok, it's really cheap but for about 16€ they could at least cut a threads in holes, so if you buy one of this, i hope you have your thread making tool set ready!
Also spacing of mounting holes is way off. When mounting 8U Unit, the 4th hole is off by about 2 mm so there is no way to put a screw through.
If you want to use all 12U, you must remove upper bar which holds 2 parts together, but at least that does not compromise stability.
Beside that, there is not much to say... If you don't have time and/or tools to make your own threads in all holes, you should buy another stand of better quality