For what it's worth, I demoed the '20 X9 75 WB, in I think 176 (as well as the '20 S9 and G9, as well as G9 FIS 188/30). I'm an Atomic fan. All I can do is comment on the feel of these, how they did and how I liked them: great except for the WB. Unless the tune was badly off, which is always possible, what the heck is it for, anyway? was the question I ended up with. I've liked regular X9s from the past year. And I'd probably like the current version of that ski too. But the WB does one confining thing: oddly carve one very tight turn that's a bit wider than a slalom ski would, without the flexibility of an FIS slalom ski to do various radius turns, speeds, or the similar flexibility of the various G9s, all of which I'd love to own, all 5 stars. Not the WB. It felt like a trap, locked in: to what? Nothing I'd want to do, actually. Can't open it up, can't ski it faster or tighter either. Just that one thing it does, mid-speeds or slightly higher unless you are very gymnastic (not just used to skiing various race types of ski relatively well).
Also, not sure if this is a ski for off piste: it's turn was so rigid, to me, that I'd only want to ski it on piste, if that.
I strongly recommend demoing these before you get a pair.
With the caveat that I may have some confirmation bias because I bought a pair, I don't have the same experience with my X9 WBs. I'm on the 168, which I picked up as an all-around coaching ski for days when I don't want to commit to the effort necessary to ski full race ski properly or don't want to be as bothered by the gravel-production efforts of a grooming team. I've got about three or four days on mine so far, and they're exceeding my expectations so far. They won't make a slalom turn the way my retail S9s will, but they will make a bigger-than-SL, pseudo-GS turn with a good arc and good feedback if I put a little effort into them. I've also found them perfectly happy to run larger arcs (albeit in a lazier manner) and maintain stability at speed, even when attempting to chase down U16 boys who struggle with the concept of finishing their turns while freeskiing.
They're also versatile enough to be fun playing over snowmaking whales and in three-dimensional stuff (mini-bumps, etc) along trail edges, and I can ski them in a relatively low-effort manner (compared to a real race ski) while still feeling like I look like I know what I'm doing (which we all realize is important when there's a club logo on your jacket). It certainly wouldn't be my first choice for off-trail exploits, but when encountering fresh resurfacing courtesy of the snowmaking folks, it did feel a bit more floaty than a race ski. I do agree with the review that noted they respond well to significant energy and aren't a particularly good choice for lazy cruising.
The other caveat I should add is that the only truly modern on-piste ski I can compare them to is the retail S9. My other race skis are either old or ancient, and my all-mountain quiver skis tend towards a bit "optimistic" in width for eastern skiing.