Back in 2006/2007 when we were researching a new motor home, quality was not my focus. Most critical was that it fit in our garage with a double main floor bed and a decent dinette. I saw my first PC in the Stevenson Convention Center in Rosemont, IL in Early 2007 (it was a 2007 2350 with a slide out) and was sold on it solely because it could meet my size and feature requirements if I special order one with a no-slide dinette. It wasn't until after we had ours home that I realized how well the rig was made. It came in part reading RV forums, other RV owners talking about their other brands. So many new motor home owners were complaining about very poor workmanship and materials. I kept reading those posts saying to myself (and to others looking to buy a rig) "That's not my story".
One of the bad stories that stood out to me, one household bought a brand new 2008 Forest River B+. They get the rig home and open one of the upper kitchen cabinets. To their surprise, there was sunlight beaming into the cabinet from the outside where the wall met the ceiling. The warranty resolution was adding more caulk outside where the wall met the roof.......really?

There were quality complaints of all kinds, and then there were (and still are) long term effects of poor workmanship and poor construction methods. Reading so much about water leaks and such, and why so, then studying our own rig.....it has been 8.5 years to-date of a constant reminder that PCs stand out as a top choice.
After the Great Recession of 2009, many of those poor rated companies were either closed up or bought up. And then a few new companies sprung up since. PCs are still at the higher end for the wall & roof sectional construction process used, Not just good methods & materials, but I think in part because our roofs are lower, our widths are smaller, and our compartmented rear wall is stronger than others, resulting in a more solid structure. A small box made of the same material as a big box will naturally be a stronger box. With that said, the 2100 is naturally the most solid of PC's. Then add things like the well made entry door with jamb, the B+ cap & transition wall attachment methods, and the PC jumps ahead of the pack even further. There is so much more than I just mentioned, but it starts with a solid house. If that isn't right, the rest won't matter for very long.