I liked the old pop-up, but the wifey wanted something a little more weather tight. After camping in Solvang this weekend, I agree. I mean it got down to the mid 40's at night. With the kids gone, this is pretty good. I bought the new one (used) for $8K and am going to sell the old pop-up for $3.4K-$4K. It works well, has A/C, chemical toilet, propane/elec refrigerator, and hot shower and hot and cold water in the sink.
Here is the old
Here is the new
The old one is kind of light and airy and very nice; the new is more closed in, but much warmer when it's cold out. Check out this 1:30 youtube clip on how it opens, it's very cool.
YouTube - TrailManor Trailer Set Up