I bought my Oxygen
Plus (hand-finished after Bonair had fire/bankruptcy - it is greyish gold colour with the blue interior with wooden cabinet finish, shown somewhere on this site).
As mentioned somewhere on this site, they are difficult to back-up as you cannot see the end due to the egg-shape. It is very light-weight and is easily towed by my Hyundai Tucson. I did have an electric brake controller added, but don't really feel it was necessary so far. the only time towing is not pleasant is on a bumpy road; on the highway you almost forget about it. It has never tugged and swayed the way my previous tent trailers did.
Mine is very well made and I'm very happy with it, but I had some minor leak issues with the vents on top.
Mine has a small air conditioner under the front seat and it shares a cooling vent with the fridge
and it is NOT doing the job. I went kayaking with a friend for a couple of weeks in the spring and it does get quite hot in the sun. I'm looking into getting a rooftop AC unit.
Sleeping room in the rear is adequate for most couples, but the front sleeping area leaves the lower part of the legs below the calves hanging over the edge. Space wise it is very comfy for two adults. A couple and 2 small kids might OK. A couple and one adult friend might be OK; any more is pushing it.
If you get one, you better be prepared to be sociable; I got visitors in every campground we were in and many compliments even at gas stations.
Having had for over a year now, I have no regrets about buying mine.