This really quite a nice unit especially at this price point. The instructions are just okay but if you separate all the parts into piles assembly is straight forward. I suggest using a mallet to make sure that the metal rods seat properly into the connectors.
  Some reviewers said they had trouble with installing the cover but its really not that bad. I built the entire thing by myself in about three hours. This unit is inside my garage for seed starting and hopefully winter tomatoes.
 so tie down are not an issue. I may get another one later and if I do the stakes supplied will not be sufficient. I have seen people use blocks but I suggest using the screw type pivot point that comes with a dog tie out chain.(One at each corner). The cover seems thick enough only time will tell on how long it holds up.
I also used quite a few of my own zip ties on the shelve=not a big deal.
All in all highly recommended.