Getting a jump on the spring...

I'm intrigued by videos of Ski-Go's classic rollerski that has natural looking "flex" with every kick (http://www.youtube.com/watch?v=b0w-K9jlkAE) Seems like this would make it a lot easier on the joints than pounding a kick into a stiff aluminum shaft.

The problem is, the video also makes it look like the wheels are pretty fast (and other reviews confirm it's faster than Swenor or V2's slow wheels).

So, just trolling for any feedback people might have on the different state-of-the-art classic roller skis out there. I'm looking for something that is slow enough to be able do diagonal stride up a mild uphill along with having a flexy shaft for absorbing both vibration and impact forces of the kick. (Nice to have is something that would roll over bumps without catching..)

Specific contenders seem to be:

- Ski-Go Carbon 780
- Swenor Fiberglass Cap (with "wheel speed 3")
- V2 Terra (with composite shaft) or standard V2 910 with composite shaft


Thanks in advance,

Jon