I have one that I am actually thinking about selling. What would you like to know?
In my opinion they have more cons than pros. They are very small inside for the claimed floor space, despite claims they are colder than a Howling Moon tent, unlike a traditional tent they take up the entire roof and the aerodynamic benefits compared with the traditional style roof tent are more theoretical that real (at least as it pertains to drop in fuel economy). On older models the ladders are a joke. The only pros they have (again, compared with traditional style tents) are that they weigh less and setup/pack up is nearly instant. Consider your needs (be honest) and how many people are sleeping in it. For some reason, the Columbus feels more like a backpacking tent then any other roof tent I have used. The rest seem like a bed with a canopy.
Because of the way I usually am traveling, the speed of setup and pack up, and lower weight spread over the whole roof, make the Columbus a winner for me, but if I had the choice I would probably go with the Maggiolina or, if I needed to sleep more than just me, a Howling Moon. My small Columbus is very small for two. If you are worried about weight on the roof, consider the carbon model, but the cost is very high. Something to note about the Autohome fabric is that it is not very dark. Whether that is a plus or a minus is a personal decision.
