Diane and I drove this fleet owner's 2003 Western Star DR unit for several months.
http://www.expeditersonline.com/dcforum/User_files/4388634e610e97e9.jpg
Before that we drove Freightliner Century Class D and DR units. Compared to Freightliner...
Reilability: Superior.
Visibility: Inferior. (straight hood restricts vision)
Ride (comparing single drive axle with lift axle trucks of both brands): Inferior... until our fleet owner modified the sleeper air bag system. The addition of a second set of air bags improved the ride. The dealer and fleet owner told us our poor ride was due to the amount of weight we had in the sleeper; though, we carried the exact same stuff in Freightliners without a ride problem.
Fuel economy: Lower. Attributable, we believe to the non-aerodynamic design of the Western Star.
Maneuverability: Inferior. We could turn Freightliners around in spaces and make corners we could not with the Western Star, without backing up to complete the turn. That may be due in part to how the fleet owner spec'ed his wheelbase.
Quality of workmanship and components: Superior
Livability: Inferior. The Freightliner condo sleepers had much more storage space.
If forced to choose between a Western Star and Freightliner, we would choose Western Star without hesitation. One thing we saw little of when driving it was the inside of dealer waiting rooms as we waited for the truck to be repaired. We saw a lot of that with the Freightliners we drove. Also, the Western Star dealerships respected our time and treated us like human beings when we arrived, something over half the Freightliner dealers we dealt with did not do.
Freightliner purchased Western Star a while ago. To date we have seen no noticable decline in Western Star quality but with Freightliner execs in charge, it is something to keep an eye on. Western Star production numbers have been cut. In a news release about it, Freightliner execs said the Star was a "labor intensive" truck to build. It seems they are still building a high-quality product, just less of them.