Decent product and frame is steel which is a plus. However, the frame attachments/inserts are cheap plastic and do not hold the tubes securely. They should be steel as well and set screws.

The shelves as cheap flimsy steel and edgy which will tear plastic if windy. Used plumbing insulation to wrap ends and prevented rips.

Also the tie downs attach to the plastic seems which tear if its windy. Bad design.

I recommend placing greenhouse on platform and using ratchet straps inside to secure structure. 

In all its ok for a small garden or a starter. Just need a few mods to make it better.