So far I've had good service from my 277RL. As you look around, you are going to find things that need to be re-done, but that's the nature of travel trailers, and not specifically Keystone. I did have some outside caps on the roof that were done sloppily at the factory, but my local dealer fixed it under warranty. I also had to go in and rebuild the supports for the kitchen drawer slides, but that was an easy afternoon project. I also added an outlet at the end of the kitchen counter, but all in all, I'm pretty happy with the plumbing and electrical installations and didn't find very much that I would have done differently.
From what I have read on here, most issues are going to involve water leaks and delamination. I resealed the pass-through doors on mine because when I pressed on the siding around the doors, I saw the sealant separate from the surface, again, to me a minor thing and an afternoon project. I would recommend a periodic inspection around windows and doors. Keystone recommends doing that anyway.