Really was not as hard to put together as some reviews made it out to be however we were a couple of nuts and bolts short by the time we got to the finish and the handle does seem a little flimsy with the door not sealing completely at the top edge - a simple fix by putting magnetic tape around the door.  
Compared to my single walled greenhouse it seems to keep the temperature at least 5 degrees celcius warmer inside - and this is at a time of year when tempertures are only about 2 or 3 degrees celcius (36 - 38 degrees F) at night! 
All in all a very good deal for the price and I can hardly wait to start putting my plants in it!  I am very satisfied.