I know a few people with Snoozy trailers and they seemed to like them. I've been inside about 3 different ones. The jacknife sofa was comfortable and the layout works well. Some owners have remarked about condensation on the walls in cold weather, and that's probably the worst thing I have heard.
I have an empty one (no interior) for hauling around the books and gift items I sell. The frame and shell seem plenty sturdy. I backed into something and broke out some of the outer fiberglass near the corner, but it didn't penetrate all the way through and a canned fiberglass repair kit put it right again. I was unhappy in the first season with the fact that they provided a wider than normal (8.5') axle on mine, but I guess it was just because they didn't have a way of knowing how top heavy I might load it and they wanted to make it extra stable; they don't do that with the travel trailers.
Check out the FiberglassRV forum for more comments from owners. A couple of the members there have traveled pretty extensively with theirs already.