Hugh, your research is good to the point that you have a lot of feedback on units that owners are willing to talk about. Some of the time you will get responses from those with grievances that would otherwise not speak up. There are also exceptions to the brands reputation.
Example: We have a Gulf Stream Scenic Cruiser that for almost 7 years has yet to have any problems. I say this hoping that I don't now jinx myself. I did five years of homework waiting for the kids to get grown and out of the house and so I was not impressed from what I had read about Gulf Stream back then. When we found this coach I was very Leary about even looking at it but we did. The more I looked at this particular coach the more I was impressed. Long story short; we bought the coach and have not regretted it one minute.
I think you should evaluate each coach independently as (some say) it depends on what day of the week it was built!
This does not have anything to do with the service after the sale; that is where your research should be spot on.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7