Hi Jeannie,
We just picked up our 21FBS back in April, and are heading out this week for 10 days on the road. We've had it out once up to Mt Rushmore in between.
For the two of us, the 21FBS is perfect. The dinette makes into a very long bed that will work for our 6' 4" tall son when and if he ever decides to come along, but I don't think I'd put two adults of any size on the dinette.
After 20 years of a popup trailer with 2 kids and a dog, the North Trail is like a palace to us. We enjoy the (almost) full length queen sized bed, we got the pillow-top option which is great. The bathroom running the entire width of the trailer makes it actually usable for dressing after showering, etc.
One thing I was unpleasantly surprised by was the length. It's called a "21" FBS, but the specs show it as being 24' long. We were expecting to be able to back it into our storage area next to our house with about a foot to spare before having to squeeze it between our chimney and the fence. When we parked it for the first time, we found out it is actually 26+ feet in length. So we're having to look at moving our access fence forward to make more room. The extra length doesn't cause any towability problems, the wide axles help a lot, and I spent the bucks for an Equalizer hitch with weight distribution and sway control. No problems whatsoever towing it with my Tahoe.
All in all, a wonderful trailer, and my wife and I couldn't be happier with it.
John