Hitch mounts are very nice but there are a few things to be aware of.
1. Ground clearance must be accounted for when backing down a steeper driveway, for example. My driveway isn't long but the apron is steep enough such that I have to take it slow. If I don't, the hitch (not the rack) scrapes the ground.
2. Access to your trunk will be a bit more difficult. Removing hitch racks isn't something you want to do routinely. Mine is heavy & bulky. But that's also why it works so well.
3. The tray-style hitch racks are the kindest to your bike (i.e. no swaying) but they also can bash your shins if you're not careful.
4. Hitch racks allow easy loading/unloading for you and for thieves. You'll want some security when leaving bikes on the rack unattended...like going into a restaurant.
That said, I love my Thule T2. It is rock-solid and tips up or down to allow access to my hatch.
