I can't really say for certain if Keystone Montana's are better than any other make/model of same price point FW's.
We started doing some research about 3 years ago when we decided to get out of boating and get into RVing. After ton's of research online, visiting numerous dealers, and attending countless RV shows, we searched and found a used 2008 Montana 3400RL.
What a great RV. We decided to go slightly bigger and newer so once again the search and research was on. Ended up with a Montana 3725RL and after almost a year of full timing in it we couldn't be happier.
Being a retired contractor/carpenter I was impressed with our cabinets and the quality of the interior material over some of the other brands mentioned that were about the same price.
All makes/models of FW's have their issues and none are perfect.