Not long ago Wondlan released a telescoping Carbon Fiber Video Camera Stabilizer, and now Flycam's caught on to the design. Although they look similar from afar they are indeed much different, and it appears that Wondlan might be the better build quality. From what I noticed though, the Wondlan has a shorter counterweight sled which could lead to twisting and swaying. I haven't tried one yet to know, but there are some examples out there that show this.
The Flycam has a much longer sled and can states it can support cameras up to 7.5lbs close to the supporting weight of a Glidecam HD4000. Pricing on HD4000 is around $550, and Wondlan's Carbon stabilizer $470, and Flycam's new Carbon Fiber C5 Telescoping stabilizer starts around $325 (found here).
Flycam C5 Carbon Fiber Telescoping Video Camera Stabilizer