Bought the Pro version (some time ago) and I reinstalled it again (v2.7.0 in High Sierra 10.13.5). The CPU speed reduction while running this (during mobile surfing, document typing, iTunes) is very acceptable compared to the battery life extension and temperature reduction. CPU temp down from 65C to 40C and battery life doesn't seem to reduce while working under normal working conditions. Amazing kit, should be standard Apple functionality. Worth the money: if you can fork out $$$ for a Mac, you can support the developers $!.