I think the ES is a great upgrade as it has some features the regular MP40W missed (and probably should have had). It is easier to set and tune etc. and the on/off button is a welcome addition. With the MP40W the only way to turn off the pump was to unplug it which lost some settings.
The only problem with the ES at the moment is a bug in the timing of the night mode but they are apparently working on a firmware update that will fix that.
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