We had a sous vide Supreme for 15 years and we're always happy with it, but it gave up the ghost after 15 years. Thought I would try this as it actually circulates the water where the sous vide Supreme worked off of convection. So here's the comparison of the two models. The sous vide Supreme was a slightly larger unit and could hold a more packages but was very slow to heat up and tended to vary outside of one or two degrees while cooking. Otherwise , it was silent and got the job done.This unit of course is slightly smaller and for the packages that we usually sous vide we get one less in the unit. Not a big deal as our family has shrunk as the kids have moved on. There is a circulator on the bottom of this unit very much like a stair plate which gently keeps the water mixed temperature wise. It heats up much more quickly than the previous unit probably due to the convection caused by the stir and what seems to be a more powerful element. I checked the unit against a scientific grade calibration thermometer and it is dead on. The control of the water bath temperature appears to occur at less than 1° f as opposed to the SUV Supreme which appeared to be greater than one degree Fahrenheit.Overall I feel that this unit is superior but it also has 15 years of Technology over the previous machine. We started in SUV when there were no recipes or really instructions and I was working off of professional chef literature and scientific papers. Now the recipes are everywhere in the process is very common and this machine is capable. The sous vide Supreme is probably put together a little better than this in the body but the lid of this unit is far superior to the SUV Supreme. I don't see why I shouldn't get another 15 years out of this unit as the only moving part is the stair plate motor and that is a well-developed technology going back eons. Very happy with the purchase and have been using it regularly since we received it.