I hope we can answer CL's question. I experienced this stuff on my VP-Free and hated it. There have been a few generations of shock and VPP updates since then so maybe things have changed?
Whenever I see any VPP bike I think of the horrors of my VP-Free. It may be unfair to paint a new bike with my old experiences but most people only know a few bikes intimately so when they read a review they'll try to assess it in terms they're familiar with.
The Instant centre, or whatever it is they call it where the chain controls the sag point, is part of the SC VPP design, and all the VPP's I've been on (BlurXC, Nomad, V10, VPFree) all suffered from it, and it annoyed me a lot, especially on the Blur for tech climbing, it would feel like the bike was trying to pull me backwards off the step.