Total
Stability
Quality

Good solid studio rack

This thing is heavy, and robust once assembled. Reasonably easy to put together (beware of sharp edges and corners) and very solid once there are a few bits and pieces racked in it. No instructions but it's not rocket science - as other reviewers have said it's probably best to start by attaching the sides to the top whilst the unit is on it's back, then put the base and wheels on. The wheels and brakes are good quality - I have it in a space where I quite often need to wheel it out to get access and they work well.

During construction, the bolts that attach the top and and bottom are a little fiddly to locate but no more so, just a little heavier, than your standard Scandinavian flat pack bookcase.