They started using these around me a while ago. The van that usually delivered to my work was one. The driver was a friendly guy (retired last year), and he liked the take off torque when he jumped back in and gunned it to the next stop.
https://www.nrel.gov/transportation/...aulic-van.html
Scroll down to publications, view the PDF, and you can see that it made a big difference in real world delivery cycles.
The vans around my area still engine off stop, but I don't know if they're conventional hybrids now or the hydraulics still in service. I haven't asked, and the new guys (they float them around the routes) frankly don't seem to give enough of a crap about delivering anything for me to bother to ask if they know any thing about their vans :-/.