My husband build a base of decking material for added stability. He did say he wished the poles had been marked for how far they should go into the connector pieces. The directions leave something to be desired, pictures only! They could use words and a little explanation. The cable ties used to attach the end walls to the frames are too short. 
So...despite all these minor things, for the price this is a great, little greenhouse. My husband started almost everything from seed this year in little peat pots whereas we usually get plants for many of our vegetables. We would have these in the greenhouse now if we weren’t in such a cold snap! Hopefully next week we will load the 
Greenhouse up!