We own a 2018 427. We have only been out 3 times in it since we bought it in Oct 2017. But we do really love the unit. As far as issues goes, only issue we know about right now is trying to get the satellite to hook up. You will find it is a great unit and the difference between this and a low end unit is like night and day.
As far as problems, yes there will be issues with things but you can except issues with all rvs, no matter what brand if it is mass produced. Keep in mind that the equipment they put on this unit is the same equipment used in other brands, looking at stoves, fridges, water heaters, etc...
Would we buy it again, yes. Would we buy it from the same dealer, yes. Are we sorry we bought it? Just sorry that we can't use it right now because of the weather in Ohio. We retire in 14 months at which time it will be used allot more.