We have two a polyscience one and a Nomiku. Both have needed service. The Polyscience runs great - cost 6x as much. But seems to use larger tubes for the pumps etc. The Nomiku is kinda a pain to use.
Nomiku told me to clean with dishwasher soap - since it gets clogged up with hard water. Never had to do that for the polyscience on in years (service issue was electrical, bad solder or something I found reported that was rather common).
Needless to say I'm going to question any cheap immersion circulator now.
