As you can see from the responses there is a mixed history with the setbacks. We have a lot of people using the setbacks with no issues at all, including the two Alaska owners that inspired the product to be developed in the first place. Some people have experienced either long ramp up times or unexpected overshoots. There are ways to minimize these issues, if you should encounter them, including dialing back the MAX setting a bit (helps reduce overshoot), increase the HLF setting (helps reduce overly long ramp up times), making sure there is good transfer of the heat of the stove into the space being heated (if it not tied into a central forced air system). For the number of set points you're wanting (at least three from the sounds of it) make sure to order the Standard+ or Advanced+ which comes with the full set of 4 weekday and 4 weekend set points.
And if you aren't satisfied with the Coal-trol we continue to offer a 60 day money back guarantee in addition to our 3 year warranty, so you can always return to your existing dial controls with a minimum of risk.
There's a lot of posts on these forums detailing people's experiences over the past couple years. We encourage you to do some searches, in addition to reading the responses you get on this thread, to get as complete a picture as you can before your purchase. And feel free to contact us directly with any questions. firstname.lastname@example.org