We've owned 3 Jayco's. One was a '93 popup that we bought new and owned for 10 years, the second was a '03 Kiwi 17a hybrid that we bought new and had for 10 years, the 3rd is our current 2013 X20E hybrid. Yes, 2 hybrids. We love them. But as said, they are not for everyone. You really do need to like tents and pop-ups if you are considering a hybrid.
Regarding quality, the initial fit and finish on Jaycos is a bit sloppy. Nothing serious, things like mis-aligned bathroom door, loose interior trim, etc. You can fix these yourself, or find it all on the walkthrough and make your dealer fix them. Otherwise they ares solid well built units. Notice we had 2 of them for 10 years each and they were still in excellent condition when we were done with them.
We loved our 17ft. We often camped with 3 adults (wife and adult daughter) and it was a bit tight but OK. Our X20E has plenty of room for 3 people, but the daughter is getting married soon so no need to worry about that anymore! We looked at the 18 ft. It wasn't much bigger than the 17 we used to have. Also the X20E has a small slide out that makes a world of difference in floor space. We love it. So if you're looking at Jayco and you know you want to move up in size at some point, you might really like the X20E. Your Durango will handle the X20E just fine.
And you'll want to join the
Jayco Owners forum. Even before you buy!
Welcome and have fun!