Not much false advertising on this product, but there are a few things to bear in mind.
1) Factor in total cost to your decision. A lot of the suppliers charge plenty for the shipping, and it doesn't come in a very large box.
2) Assembly is not complicated, but an accurare, firm and steady hand is required for the type of push fit components supplied. It should be easy to see what you're supposed to do (even with the neglidgeable instructions) but it's also easy to damage a component by over or under doing things.
3) Yes, it's not very stable if free standing. So unless you can be sure it's in a peculiarly windless area, I would agree that it is wise to anchor it somehow and to follow common sense practice: put heavier specimens lower down and the lighter stuff up top.