I bought 2 of these, both had issues, but I decided to just deal with them as the price was reasonable.
The drawers are stuck together in a way that if the plastic which separates them is not exposed it takes a lot of force to pull them apart.   Out of 24 drawers, 7 of them do not stay on the track as they are extremely warped, 2 others the tab/stoppers were broken off.
I am hoping that over time they may straighten out.
Easy to put together, except for the wheels and casters, no directions for these are included.  We found it is best to try to get the casters in before putting the wheels in.