I bought the Dacula Greenhouse in white.  It took me sometime to get it assembled, but it feels pretty sturdy with the cover on it.  Hopefully my container perennials will winter in there instead of filling up my already full garage this year.  The shelves might be good for those that do trays of starter plants in early spring, but they are useless to me.  They are really lightweight and flimsy and can't take the weight of my pots.  Honestly, I almost wish I could have got this greenhouse without that feature so that I have more available floor space, but oh well.  With our landscaping, I don't have a lot of room for a greenhouse, so I went with the best footprint I could squeeze in.  So far I really like it, but I've only had it two days and the weather is still mild.  It sits against the privacy fence in our limited backyard and will disassemble when Spring rolls back around.