For those of you who don't know how to play demos, here is what you do:
go to your base folder in jk2 and create a folder called demos. Place the demo inside the folder and then fire up multiplayer JK2. you will see the Play Demo option. Choose the demo from the list. Before you do this, you may also wish to bring down console in the main menu and type "cg_drawthirdperson 1", especially if you are watching a full weapon demo. Demos must match up to the respective version they were recorded on, so a 1.02 demo cannot be watched on 1.04.
I will post the first demo. This demo was a practice offense vs defense between myself and JaX (most beastly defender in jk2 history). Some cool trick jumps by myself and some amazing shots by JaX in this one.