I bought a 413T early in 18 and have been decently satisfied with it. I've fixed a LOT of minor issues but it hasn't been back to the dealer at all yet, although it's going in January for a fresh water leak underneath somewhere. I did replace the brakes under warranty through Lippert, so no fault of Jayco.
We don't use it for leisure, my son races dirt bikes, so we're in it around 25-30 weekends a year. I put around 15K miles on it this year. So with our use, I'd say it's been pretty good. No real design issues to speak of in my opinion. We opted for the sofa vs. the dinette.
I tow it with a 2018 Ram 3500 dually but I had a 2015 Ram 2500 for about half the year. The 2500 did just fine, although you'll be told a 2500 isn't enough truck. The only reason I upgraded was I wanted the Aisin and 4.10's. The 2500 and it's higher gear ration seemed to really cause it to work a lot, but the truck itself handled the load really good.
I did extensive homework prior to buying. The Talon and the Seismic are VERY similar in overall build construction, down the the R values. Just minus the bells and whistles. It's even wired for the 3rd AC, you won't find that in any Talon literature because it's a selling point for the Seismic.
I can't speak for Camping World, I ordered mine from my Jayco dealer, who I've bought from in the past.
2018 Ram 3500 DRW CCLB Aisin 4.10 4x4
2018 Jayco Talon 413T
B&W Companion