WIP GAME UPLOADS?

I've been working on Shadow's Reach for a while now and whilst the original demo had a relatively easy and obvious place to stop and break for the end of the demo, the game from that point has been quite driven and more continuous in its make-up. At the same time however I am very much aware that the demo needs updating. So the question I ask is simple and two-fold:

1) What do people think of WIP game downloads that offer a bigger chunk of play than the demo but lack that complete sample feel?

2) Would they rather see an 'end' to a WIP demo where the player is taken to a special screen, or simply be locked out of the next area and left free to roam the world completing side-quests?

As always, I appreciate everybody's comments and fully encourage discussion :)