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If I did not use a dew heater of both scopes I would not get any imaging done. My site has very high dew. Dew forms nearly every night. If you don't have dew control you dew up very quickly.
Seeing in the dome seems ok to me. The shutter opening is quite wide so that probably alleviates the thermals to some extent. The shape of the scope dome being a ball on the ground with no walls also probably helps control dome currents. The images I have produced with the RC12 in the dome seem sharp enough to me and not really affected by dome thermals. I could be wrong I suppose.
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