We own a 2017 Reflection 27RL that we purchased new. I can verify Grand Design quality is probably very similar to other major brands and the ownership experience will be dependent upon your ability to do self repair. Also the dealer you purchase from can play a large role in resolving issues in a timely manner. The Internet is full of horror stories. You must understand a few basic principles of RV manufacturing. Lipert makes nearly all frames for all 5th wheel brands. There have been issues and again lots of Internet information is out there. I would encourage you to do a thorough walk thru and systems check with the dealer before you write the check. In my opinion the manufacturer does not test for leaks or other basic problem areas. It's up to the selling dealer to repair all issues that surface "after a shake down cruise" as my salesman stated. Believe me there were many issues!! Fresh water holding tank would not hold one drop of water was the most apparent problem. We have taken our 5th wheel across the nation 6 times into the Rocky Mt areas and overall things held up well for the most part. RV's experience a constant earthquake when being pulled down the road. You will always get to resolve something when you get back, hopefully you are able and willing to do so on your own and not rely on a dealer for every small issue.
The most upsetting issue we have discovered just recently surfaced. I noticed on the day we took delivery that a bulge in the lower aluminum skirt next to the back wall. It seemed to be getting larger each year an so finally last season on the return from the last trip I removed this lower skirt. I was shocked at what was happening! The entire back wall was not secured to anything on the bottom. All that held it on was the screws on each side wall and the roof!! So the back wall just shifted back and forth as the trailer was being towed. My trailer is well past the 3 year warranty so I fabricated and designed my own method of securing the rear wall to the floor. However if you do an Internet search for this problem you will see other brands have experienced this problem !! Basically RV's are assembled quickly and all brands will have issues. If you can find a late model used one for sale give it some consideration. Someone else may have already experienced the "shake down cruise" and resolved all issues.