I think an on/off can work if certain conditions exist.
1) If you are available to check temps at least two or three times daily.
2) If the incubator is placed in a room that in itself keeps extremely stable temps and humidity.
3) If you are not constantly opening the incubator causing fluctuations.
4) If you have a very good digital device monitoring those temps/humidity.
I used an on/off myself last year and had a 100% hatchrate on three clutches (an admittedly small sampling). It worked, but personally I didn't enjoy the experience and wouldn't choose to repeat it. It caused me more worry and stress than I needed during the incubation process.
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