The Orion V was OBI's most popular transit bus. The first production bus was sold to
Mississauga Transit. Major transit agency users included New York City (
MTA), Toronto (
TTC), and Washington, D.C. (
WMATA). For MTA, some buses in the final order from 1999 were unreliable and plagued with significant structural corrosion.
Coast Mountain Bus Company in
Vancouver operates the Orion V Suburban models built in 2008, the last buses built for a Canadian agency. The last Orion V models were built for
Sonoma County Transit in 2008. TTC retired its Orion V fleet in December 2015; the retirement event featured a final 40-minute ride on No. 9411. As of , a handful of Orion V models remain in operation such as Beaver Bus Lines of
Brandon, Manitoba, which currently operates a number of former
GO Transit buses built from 2000 to 2004 and
Coast Mountain Bus Company in
Vancouver that also runs the suburban Orion V models built in 2008, as the last Orion V buses manufactured for a Canadian transit system. With
Everett Transit retiring their remaining 2001/2002 Orion V buses in December 2024, that leaves the
Bee-Line Bus System,
CyRide and
Sonoma County Transit as the last operators of the Orion V buses in diesel and CNG configurations in the US. ==Competition==