I had the Vertical Doors Inc. kit installed last Friday, and love it so far. It works great, and they aligned it well. They cut the fenders really clean as well and that's key to a nice looking ride once the doors go vertical, especially for car shows. I just started a thread with a video of my car and the Vertical Doors Inc. owners car (C6 Corvette). This video will show you the visual comparison of the vertical doors (on my car) versus ZLR doors (on his car).
Here's a link to the thread:
http://www.camaro5.com/forums/showthread.php?t=203308