I have a switch to turn assist on and off in my car. It's usable; even without the IMA it has more power than 90's Geo Metros. I often do extended hill climbing in a lower gear with the IMA turned off anyway, so I don't run the battery down. It's nice to have when passing someone on a two lane road and makes starting in first on a hill a lot nicer, but I could live without it.
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