I do have say that Grand Design customer service is pretty good. We do not have a fiver, but our 2800H is surprisingly good.
Part II to any purchase is the dealership you buy your rig from. A lousy dealership can magnify problems.
The GD we have is significant better than the Puma we had before, but then it cost about $10K more. We got a lot of good use out of our Puma and it served us well for many years.
Still things like the fast recovery hot water tank are a real plus. I still cannot figure out why all the manufacturers don't want to install 12 volt outlets!