The last couple of times I tried to use it, after charging it up it shot a stream across the room.  This initial burst uses up all of the carbonation, and what remains is nearly flat.  It's like the valve has an all-or-nothing hair trigger, yet when the assembly has been taken apart, the valve works smoothly. 

Any ideas on what would cause this overly pressurized situation?  A bad batch of cartridges maybe?  This bottle has been reliable for several years and it's a nice piece that I'd like to continue using.

I understand the logic behind no air space, but like Matt's, there's a fill line on mine. 

I usually chill the water first.  Last night I didn't because I was giving a demo.  Needless to say, my friend who said he wanted one was not all all impressed, except with the distance the thing could shoot.

 I'll just let that . . . hang there.

Interesting system.  I've never seen a bottle that didn't have a fill line.  The ad copy seems to suggest that the fill-to-the-top method eliminates spurts.  Considering what my bottle does, that's putting it mildly.

I noticed though, that the bottle in the video is NLA.

Matt, I think my bottle is too old to have ever had a tube insert.