i actually have one right now and i have noticed that i do have to adjust it from time to time to either raise or lower the temp on the warm side but really i dont mind so much right now cuz i have the time to monitor the temps closely which i do. the dial control is kind of annoying but with my budget this was the best thing i could go with at the time. i do plan on upgrading to a digital eventually but i'm not in a big rush. i'm satisfied that it's working how i need it to work considering the fact that i have to monitor it so closely which again i dont mind doing.