Happy with these. Assembly is super easy (make sure to tighten all connections so the cover slips on easily). And keep an eye on unseasonably warm weather so you don’t bake your seedlings! Even in NJ a warm winter day was too warm for some lettuce sprouts without ventilation. Not the product’s fault, it did what I purchased it for - to help keep my winter garden warm. For deep frosts, I covered in additional plastic.