We are 22 months into our 2017 Challenger 37LX. We had the first year hiccups to deal with but nothing major and all were handled under warranty. We use it as much as possible. It serves as our "beach house" near the gulf coast of Florida over the summer. We just got back from a 2 week, 1700 mile round trip to Asheville, NC and Helen, Ga, where we met some friends who bought a new 2019 Hurricane 29M. They're new RVers and loved our Thor so much they went and bought their own. They love their Thor too!
One funny story from our recent trip, we were following Google maps trying to get to Unicoi State Park in GA, when we suddenly saw a sign that said "Pavement ends in 500ft".
Yeah, that'll bunch your panties! A certain scene from the movie "RV" came to mind. lol Anyway, after stopping for a brief moment to consider our options we decided to press on. All went well but it was a high stress 2 mile drive! In our defense, there were others behind us who apparently followed the same map, including a truck pulling a 5th wheel.