Here's one that does NOT do it very well:
2018+ Jeep Wrangler 3.6/manual transmission. It's ok, but not really seamless and if you try to take off too quickly, with a fast clutch release, it can stumble and not start, causing you to have to restart the engine. Once you learn the quirks, it is ok, but I prefer not using it.
And here is one of the best I've driven:
2021 Jeep Wrangler 3.6 Etorque/Auto transmission. This thing is flat out seamless. This is how ESS was meant to be. It is night and day better than the manual. It uses the belt start generator for ESS and only relies on the starter for cold starts. It is a wonderfully executed ultra-mild hybrid system.
I've got both Jeeps. I absolutley loathe the ESS on the manual and have a programmer that remembers where I left it, so I shut it off and leave it off, only rarely using it at drive through windows at fast-food joints. That's it.
Here's the irony, to me. We have ESS, but also remote start, which wastes as much gas as idling at stoplights on a long commute (or more). Why not get rid of ESS (or remember your preferred setting) and get rid of remote start? Then call it a wash.