I read some reviews about this product not being stable and I must disagree. I highly suggest using a rubber mallot to ensure the poles are seated securely. I'm truly amazed and happy with my purchase. Yes you can assemble with no tools but I found by using the rubber mallot the poles seated deeper and more secure. There is a second seated position I wasn't able to get to with just my hand strength pushing down. Great instructions. Perfectly packaged. I'd definitely recommend.

4 stars because the first one I bought was great. I bought 2 of these about 2 or 3 weeks apart. The first one came in, put it together rather quickly and set it up. It's really not that hard. Once I started filling it with my seedlings and plants, I realized I would need another one.

Second one comes in, box is slightly different and there are slight differences in the product as well. There is a horizontal bar that goes across the top to connect the two angled pieces. Not necessarily needed, but you never know. I also use this indoors. I could see a larger need for this outdoors - if the plastic melts, this will keep it from sinking down. The shelves were all bent so I had to slightly bend them back into shape. The zip ties that came with it are thread thin. When you put them on, the teeth don't even hold so they open right back up. Someone was trying to save some money because the zip ties I received with the first one were nice and thick. The plastic also doesn't go all the way to the floor like it does on the first one. When attempting to put on the casters, one of them broke the shelf frame.

I have 2 gripes for both.
1. There is nothing on the bottom to catch dirt/water. This isn't a problem for outside use but definitely for indoor use. To solve this. I put 2 long tin pans under the bottom.
2. The shelf holes are approximately 1.75" x 1.75". When I put my nursery pots in there, the "legs" tend to fall into the hole causing the plants to lean. You have to turn them until you find the magic spot where they don't dip into the holes in the shelves (time consuming). 1"x 1" or smaller would have been much better.

Overall these greenhouses are great for indoor use. I haven't tried them outside and probably won't because they are so small and I get high winds where I live.

I would have given a 5 except none of shelving fit. The directions were challenging but eventually it came together. Its been up through several rains, high winds and of course, heat.

So far my plants has died.

This is the least expensive greenhouse of this size I've ever seen, and of course you get what you pay for. I got it to save the trouble of constructing a cold frame for vulnerable plants over the Winter, and I'm optimistic that it will work well for this purpose.

Some observations:

1. There are two different designs shown in the listing. One has single-tube rafters that run from one side to the other. The other has a steeper roof with separate rafters that join by connectors at the peak. The main difference is that the first one has higher "shoulders" (eaves?), allowing it to have a cross bar at the top of the entrance, which the other design lacks. I received the second version. So far it seems sturdy enough, so I'm not sure it matters.

2. The plastic cover has a rubbery feeling and is somewhat elastic. That means that it sticks to itself, making it a little tricky to unfold. More important, the wrinkles from folding have to be stretched out flat to get it to fit over the frame. That takes a lot of gentle tugging, but it can be made to work.

3. It's critical to ensure that the steel tubes are fully inserted into the plastic connectors when you assemble the greenhouse. Otherwise the frame won't be square, the cover won't fit over it, and the shelves might not fit right. I missed this for one step but discovered it when one set of shelves wouldn't fit, despite being the same size as all the others. Once I corrected it, the shelves all fit fine.

There were also two mistakes in my delivery:
- One of the tie-down ribbons was accidentally sewn into the zipper, so I had to cut it off. There was enough ribbon left to tie it down, so it was not a major problem.
- One of the connectors was the wrong kind, but I was able to saw off an unneeded connection socket so that it wouldn't poke into the cover. If it had been the other way - fewer sockets than needed - that would have been more of a problem.

UPDATE: The greenhouse worked well enough for a week or two, until we experienced a cold snap that went down to 8 degrees F. The plastic became so brittle that it tore in the wind, so now I have a couple of large holes torn open.