Their quality control is poor. I bought a Flycam Nano a year ago with plans to do a partial DIY to it, but the main bearing had problems in that it would loose its balance as you rotated it in the vertical axis (similar to http://www.youtube.com/watch?v=egYDzkw85i8
, but worse). I emailed the seller in India, and they send me another one, minus the washer weights. It actually had a significant number of different parts. The new one didn't have the balancing problem however. I used it with a Samsung HD camcorder.
I hesitantly tried it with a 7D and 16-35 lens, and it worked well enough. I wouldn't trust the materials with aggressive handling with that setup though.
If your budget won't allow for a glidecam for quite some time, I wouldn't risk it if you really want to put the thing through its paces. And be prepared to have to deal with problems. Your best bet would be to try and buy one used, which is already working well.