Dalen EARLY Season Starter (mini water greenhouse)

saw this at walmart, Dalen Season Starter, its 10 bux and its basically bubbles of water surrounding the sides of the plant, like a mini greenhouse.

Has anyone ever tried these? i picked one up and im about find out how they are

Work very well for younger plants. When its cold/windy at the beginning of the season, my girls are doing nice in their mini greenhouses.

great do you think they would be okay if it was 30 deg a couple nights in a row? im not sure if i want to risk it this early..