I really like this unit.  It is pretty strong for the price, however the caster wheels are weak and two of them failed so I do not recommend rolling it around any more than necessary. My plants have been doing very well in this little vertical greenhouse. Its better to use it indoors to avoid mold etc. the PVC cover is very nice, it had two good zippers and ties so the front panel can be rolled up and tied. Overall I am very happy with it and I just ordered another one.