Here are a few pictures of my CooCase trunk. I have it mounted on the rack recommended by Twistedthrottle.com. The rack is not nearly as nice as Phils but then again it is considerably cheaper and if you are using this case it is covered up by the mounting plate anyway.
One other nice thing about this set up is that there is some adjustment for and aft, With the Givi Monokey system if the pass backrest doesn't happen to fall in the right spot for your passenger you are SOL.
The case has three tabs on the bottom that lock into the forward part of the mounting plate. The back part snaps into place similar to all the other trunks I have seen. The electrical connectors for the locks and lights automatically connect when the trunk snaps into place so you don't have to fuss with any wring when removing and installing.
I did get the backrest option and my passenger does like it. Its nothing fancy, just a firm rubber pad screwed to the lid, but much appreciated back support.
For comparison, for the trunk, gloss black lid, steel rack, and backrest came to a total of 339.97. I bought a t-shirt to bring the total over 350 so I could get free shipping.
Bike looks kind of pathetic sitting in the back yard waiting for new seat to arrive this week.....
Probably not the highest quality setup but I am happy with it, no regrets