A few weeks ago I found myself in Tahoe with my VFF KSO Trek and decided to take 'em for a run in the snow. The snow was crunchy and had not been compacted. As a result, two out of every three steps you would plunge through the snow for 5-10". Probably some of the more dangerous running I've played around with because the ground was so unpredictable (sometimes your footing would hold, sometimes it wouldn't), but it was highly entertaining and exhausting (worse than running on a beach with dry sand). So if the VFF KSO feel very lightweight and like tiny wrappers around the pads of your feet, the VFF KSO Trek make you feel like you've got tank treads on that crush whatever you step on. A very different feel, but not a bad one. You can still "feel the ground," but the sensation is somewhat muted compared to running with VFF KSO. That said, it's still orders of magnitude better than traditional fail running shoes.
Here's my Run Keeper event for my run. Nothing fancy (certainly not fast), but I took a few pics along the way so you could see the terrain (click view details to see the actual photos).