So-so. Bad engineering (the devil is in the details).
Assembling it is quite difficult due to the poor engineering. You slot something into place and something else pops out.
As other reviewers noted, the shelves bases are quite thin, but they should cope decently with weight, as there are extra supports half-way through the width.
It's not tool-less as you are going to need a mallet, screwdrivers (flat tips) and also clamps can help.
I had to widen many of the metal loops the shelves supports slot into, to assemble the unit.
I used a screwdriver in order to do so.
It can be assembled alone, but some help would be useful.
The price would have been reasonable, if I hadn't previously bought some plastic units that can hold 500Kg instead of 175 (for a third of the price).
The frame's metal edges are quite sharp and can cause cuts or damages to cables and other delicate stuff.
I can't see why not use bolts and nuts, but make them more stable and much easier to assemble. Encasing the nuts, you could even assemble it with a spanner, pliers or similar (so only one tool would be required).
Verified purchase: YesCondition: New