Maybe just the models I've used? I think I have tried 5 different models in the last few years, from the very cheap, to the relatively pricey, and all were rel

Maybe just the models I've used? I think I have tried 5 different models in the last few years, from the very cheap, to the relatively pricey, and all were relatively lacking when it came to fine control. I don't think there's any real reason why they shouldn't have fine temperature control - presumably the temperature is controlled by the switching speed of the mosfets in the coils?