I am truly glad you have had a good experience with Keystone. If you go IRV2.com forum there tends to be an overwhelming opinion that Keystone customer service blows. Maybe a good local dealer can help mitigate some of this and a ****** dealer will exacerbate the problem. Also not sure the Montana would be considered a Luxury brand for 5th wheels.
You can go to any forum about any product and walk away with a negative don't buy, don't touch attitude. People do not go online to compliment nor do they typically represent their problem exactly, it is more sided to support their position. Look at the number of posters that come here and post something like "I heard the RAM has issues with ..." and yet no one here has ever heard of or experienced anything close to what the poster stated.
I hang at rv.net and irv2 as well as a few others. Negative posts about Keystone aren't any more frequent than with other manufacturers and likely less since Keystone sells more product numbers. When you read into these negative posts, the problem isn't Keystone, it is the worthless RV dealer.
When my bride and I started to research RVs, and we started out knowing nothing, my first education was do not bother with online forums. No matter what model/brand I asked about, negativity poured in.
Our best real-world education came from talking with folks at campgrounds. Interestingly we didn't hear very much about issues with the various RVs people bought, all the complaints were about their RV dealer.
We ended up buying a Montana for a number of reasons beginning with the floor plan (mention above as important). Knowing all of the RV dealers in our area were going to be the issue we sent out a bid package and the lowest bid won.
After delivery, we had two issues with the Montana, the toilet bowl wouldn't hold water and the basement TV antenna jack didn't work. After not one or two returns but three repair attempts, the RV dealer still failed to fix the issues.
I fixed them myself, the antenna issues was a short cut center lead in the F connector and the toilet issue was the ball that closes the hole had a bur.
I don't know what defines "luxury" in RV speak. We looked at a lot of RVs and I noticed the more amenities, the heavier the RV became. I had a tow vehicle goal of single rear wheel 3500 period.
The Montana we purchased (3790RD) came with many amenities other RVs we looked at were missing. For example, the Montana came with six point hydraulic leveling, MORryde pinbox and true track suspension alignment, LED lighting, ambient lighting, fireplace, king size bed, all cabinets had roller drawers, powered vents, ceiling fan, heated theater seating, 12 year roof, four seasons package, and the list goes on.
After three years of pulling the Montana around, I have no complaints and still problem free.
What do you consider is "luxury" in RVs?