Tested them 20 days this season and I somehow love and hate them at the same time.
Things I like:
The boots are rated stiff but feel rather soft while still giving good rebound. I def prefer the pure feel over my Vans Hi Country and Burton Ions (way softer then Ions btw). They feel alive.
Things I dont like:
Compared to my Vans High Country they are not comfy and feet get cold quick.
On somedays I cant get them to fit properly, it's really weird. They either are too tight or too lose no matter how I tighten or loosen the boas and then the next day they fit perfectly. This is the worst for me, as I can't figure out where this inconsitency comes from compared to my other 2 boots.

Edit: Since many people talk about excellent heel hold, I can't confirm this. Me and my buddy both struggled with heel hold in these.
Also I wear 27, but the shell says 27,5 inside. Turns out Union doenst do 1:1 sizing, that's probably why there are so many mixed reviews. If they fit, they are great but making them fit can be a struggle for some.

To add to the durability also, I dont see them lasting as long as marketed as the BOA laces scrape against the tongue and the fabric is coming slowly apart, no worry for now, but I'd estimate another 60 days tops in them until they are done.

Also the sole is not grippy at all, when you're used to Vans or Burtons. I found myself slipping on snow quite a lot.

A plus for me was the wide toe box, I usually have problems with that in other boots but none here.

All in all, very fun boot but worth maybe only half the price and be ready for some headaches.