UPDATE: Here's a video we came across that does a great job of showing what can be done with an HD-2000. Video is by Amir Zakeri.
You’ve seen smooth handheld video, now make it your own with a Glidecam HD-2000. Your use of a handheld stabilizer can dramatically increase the production value behind your video, and help you achieve stable shots more quickly than with battery- and power-hungry stabilizing systems.
I am a wedding videographer and am looking at purchasing either a Glidecam HD-2000 or 2000 pro. There is a $200 price difference between the two, so I'm trying to figure out why the HD series is so much more expensive (if it's worth it). Also, does anyone know how often upgrades to this series are released? I don't want to buy the HD if they're going to upgrade in April.