My DT ball mount finally came in. My first impression is that it is a very well built hunk of billet. It came with 4 keys which is nice. I got the 6" drop/7" rise version with a 2 5/16" and 2" *****. The action of the locks and pins is very smooth and there are rubber covers to help keep the salt, dirt, etc out of the locking mechanism.

You can store the ball mount on the back of the hitch under the truck but I found that there is not a lot of clearance when you do that. My driveway is quite steep so I will not be keeping this in when not towing as backing out to quickly would not be good. Here are some pics:

The hitch in the receiver:


At the bottom of the driveway:


Stowed:


Clearance stowed: