I know what you mean. The carrier is rated for 500 lbs with a class 3 hitch, but it seems tenuous to have your bike hanging out in space at 75 mph and supported by only a single point of contact! Then again, I've towed my airstream long distances and its tongue weight is more than that.
I've used one for dirtbikes with a small SUV. I actually had a bike falloff once, although I don't remember the specific circumstances. In general, the ramp to load your bike is kinda short, so it can be hard to load the bike. Also, the tie-down points aren't offset very much, which reduces the stability substantially. The drawbacks are: Tie-down stability, difficulty in loading and tongue weight. The plus is: not needing a trailer and ease of storage. Personally, I'd use a trailer if at all possible.
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