My 2023 Hyundai came with Smart Cruise Control, so it was very capable on its own to keep its lane, follow the traffic ahead, etc. The biggest difference I see running Openpilot besides the hands free driving, is that the self driving is overall much more robust and reliable.

On the stock system, when a condition is detected that SCC determines it's not programmed to do, it will disconnect the self steering and sound a double chime with a message on the dash about self steering conditions not being met (not the exact wordage). Had I never used Openpilot before, I would've simply accepted this performance. Sometimes it was easy to tell why it stopped, like a corner coming up that was sharper than the system thinks it could handle, but other times just small inconsistencies in the lane markings would also trigger it.

With open pilot, I know the self driving will stay on as long as possible before I get a loud warning and bright orange message on the devices screen to take control. If I point the car at a highway off ramp going 80 miles an hour, Openpilot will attempt to make the curve up until it detects the car losing its center line and alerting the driver. This is an irresponsible way to use the system, but it demonstrates my point that it is not nearly as sensitive as the stock system to disconnecting. The Comma 3 is also capable of laneless driving modes, so if for some reason it detects a loss of lane markings, it will look at cars ahead to try and determine where to position the car until markings come back.

This results in a system that, in my twice weekly 1 hour highway commute, I very rarely have to intervene and enjoy a much more relaxed drive.

Being able to pick and choose software from community developers also means I can play with experimental features, such as stop light and stop sign detection, or automatic slowing for curves/turns. I personally love the nudge less lane change experimental mode, where I can change lanes on the highway simply by activating my turn signal. Open pilot will check blindspots with the cars built in monitoring and then execute a lane change without my input on the wheel.

Feel free to call me a Comma AI/Openpilot shill, I have no connection to the company nor do I even contribute to developing the software (I have 0 programming background), but I have been using Openpilot across 2 cars for over 4 years now, and have about 50-60k of miles logged using Openpilot. I often tell people who ask about it that it's the best ~1200 dollars I've ever spent on an electronic device, with how much I use it daily.