Volvo On Call is a application. All around braking improvement is the main thing I've noticed...maybe steering is a little better. Startup screen on the Sensus seems a little faster, and this upgrade may help with Sensus' overheating issue....I have taken it a step further with tint and dot matrix film to shade the screen and help with sun reflecting off the chrome.
Back to braking, after entering the freeway, merging into traffic, and traveling at higher speeds, when you resume your previous much slower set speed, it no longer results in a harsh brake application, it now coasts a bit before trying to slow.