I have had the two bike version for years. What I like the most about it is that you can adjust it to fit a number of vehicles and also adjust it to store compactly when you're not using it. It's also solidly built. This way, I was able to send the rack down as luggage during a supported ride and then used it on a rented car back to the starting point.

It's secure on long car rides, but in my experience you have to double knot the straps in place to make sure there isn't any slippage. I guess that's the only problem I can think of.