In what way(s) did your car perform better?
I’m not familiar with the process, but why couldn’t the driving be done by you? And is there something they plug into your car to access some kind of diagnostic/programming feature?
Yes, they plug a laptop with software purchased from Subaru into the obd port. During the drive the software makes adjustments to the Eyesight system and then gives a numerical score on the calibrated results. IIRC 92% was passing, my car scored 96%, which the tech said was typical. The tech said he rarely sees one fail, but if it does then either the glass has to be replaced again or the Eyesight system serviced. Procedurally they have to drive the car, I was just glad to be invited along to observe.
They still do a static calibration in the shop before the dynamic driving portion. The static calibration primarily ensures the cameras weren’t bumped out of place. If it passes the static, chances are if it fails the dynamic the problem is with the glass.
The first obvious improvement in performance is maintaining lock crossing intersections without lane lines, whereas before it would lose lock entering the intersection and then relock afterwards. A second example is locking on when engaging lane centering in a curve, because before it would only engage on a straight section of road. In terms of actual smoothness in curves I haven’t seen a change, but have heard the new system in the 23 is better. Ours arrives in March so I’ll know for sure then.
Eyesight did save my wife from a low-speed rear end collision at a signal, so the system does work. Many don’t think calibration is necessary, but insurance pays for it so you may as well have it performing at its best.
Another change from 20 to 23 is accident avoidance up to 50mph instead of 30mph, plus the ability to steer around obstacles to help avoiding collisions provided there are no obstacles beside you. I still remember the dealer demo when we bought our 20 where we approached on obstacle at 30mph and watched the car stop itself with just a couple feet to spare. I recall a magazine evaluation a few years ago where Subaru was shown to actually avoid collisions up to 35mph, exceeding its 30mph rating. I believe Subaru was the best performing brand in that test.