I put together a Juwel Oversized Cold Frame with the Extender Package as well as two automatic hydraulic arms to open the top panels in warm conditions. It was a very high quality product and was straightforward to put together. It has worked perfectly, although I did have to secure it to the ground to keep it from moving around in high winds. That was not particularly difficult to do, although the stakes that came with the product were not sufficient by themselves to adequately secure it.
A fun and useful coldframe for the home gardener. Needs to be secured from any wind damage. Mine has survived the winds of Kansas.
I love it! The cold frame held up to wind and rain this spring without any problems. It was easy to clean when it was time to store it for the summer. I'm planning to put it back up in October and plant lettuce. Other than being a little difficult to initially figure out the assembly, it went together well.
I bought this to grow cold-weather veggies over the winter and will be trying that this year. I think that using matte-black sprayed plastic bottles inside (filled with water) will act as a heat sink too. This was relatively easy to assemble. And it is easy to move as long as you keep track of the little rods.
The cold frame provided us with lettuce, carrots, onions and spinach most of last winter. We have again planted it with cabbage, carrots, spinach and lettuces this fall for this year's winter use. I love the automatic opening tops, but hate having to hand water. It would be nice if somehow drip irrigation could be incorporated into the system.