Purchased the seedling heat mat to get a jump on growing warm season seeds (tomatoes, peppers, and the like). These seeds need a warmer soil temperature to germinate and they benefit from the increased humidity created from the action of the heat mat with moist soil. Consequently the mat has performed well, we were able to get to large flats of tomatoes and peppers to germinate almost immediately and they are now up and have their second set of leaves so that we can transplant into larger containers. Have had no issue with this heat mat, it works well, maintains and even soil temperature and the mat is well sealed so that wet trays sitting on top do not cause a short.