I got the chance to try spindrift's Concepts up at Stevens Pass yesterday, only took them for a quick test drive. I haven't had a lot of chance to ski a lot of skis like this, skis that are experimenting with different sidecut and camber profiles. My current fat skis (which I was on that day so I could compare them back to back) are Dynastar Huge Troubles, a fairly conventional flat camber fat ski.
My first half of a run on them was mostly soft groomers with a little soft snow in between trails, it was basically just a run back to the lift. My initial impression is that they were very loose feeling compared to my HT's, just a totally different feel on my feet. Not necessarily bad, but something I'd need to get used to a little. The next run I took them into a mix of soft, cut-up, partially tracked out, boot deep snow. It wasn't pristine untouched by any means, but still soft and forgiving, the same snow I'd been enjoying so far on my HT's. After the first couple of turns, I was pretty blown away. These things are crazy nimble, at least compared to my HT's. They'd just come right around with very little input, super easy to ski in the 3D snow. I also had them in some very, very small, just starting to form, soft bumps where it had been skied out a little more. There, they felt just as nimble and easy to ski. Back on the groomer, I started to get a better feel for how they do on firmer snow. I didn't push them hard at all, I'm not all that demanding of my skis on groomers, but they held an edge very nicely on the soft groomers and definitely had a smaller effective turn radius than my HT's, so they felt a little more lively.
They didn't seem to punch through the chop quite as well as my HT's do, but that's one thing those skis do so well so that was kinda to be expected.
All in all, a very fun ski. I enjoyed them much more than I anticipated. I'd be interested in trying some more skis in this genre to compare, but I think when I go to replace my HT's I'm going to go for something along the lines of these. They were just so easy to ski, and fun.