I've never experienced this in a Transit, but just prior to purchasing my van I had a rental car with this option. Slickest feature ever!
It has added years to my life by removing the annoyance and anger toward those incompetent drivers that can't maintain the same speed. Yes, the ones that gradually slow down to well below the speed limit for no good reason, causing you to have to cancel your set cruising speed and eventually change lanes and overtake ... which subsequently alerts said driver to their speed loss and causes them to then overcompensate on the accelerator, leaving the people who are now starting to pile up on your ass to wonder what this massive white tin can is doing all alone in the passing lane.
Or worse, those a-holes don't give you the 5 seconds it takes to make sure it's all clear to return to the slow lane, and whiz beside you on the right, cursing your "inconsiderate nature" the entire way by.
(sigh) Ok, feels good to get that off my chest. 😁
Yup, good feature even if it doesn't handle stop/go traffic.