I had mixed opinions about ordering this rack (20U) after I read all the reviews. However I can only say that I am pleasantly surprised. After reading the reviews I expected this to take hours to assemble, however it took sub 1 hour to do alone. My 20U unit had the numbers on the front even though the pictures does not, only on the 9U unit, however I do not mind. My 20U unit did not have the coasters from the 20U unit pictures ( which looks like office chair wheels ), but instead it came with the 9U coasters, which seems durable enough. I have mounted probably 80KG of gear + the rack weight itself around 18kg so almost 100kg and it's not problem moving it around. People also complain about the screws, that they are un-tapped and how even an electric screw driver will have a hard time, also that they are philips heads. I had no problem what so ever, also sure philips heads might not be the most optimal, but if you are using the correct gear there aint no problem. Maybe people are getting different versions of this rack, mine was shipped from Czech Republic if that matters.