The ESS is pretty seamless with the 2.0L I have in my JLUR. By the time I lift my foot off the brake and over to the gas pedal, the engine is started and ready to go. If I am doing a lot of stop/starting, I will disable it. Or sitting stopped for a extended period of time and the A/C stops blowing cold, I will disable it. Mostly I am getting used to it though.