Some additional thoughts...
Weird to hear the customer service issues above, as I had an opposite experience. You all remember how ridiculously bad the shipping industry was around this past holiday season. They voluntarily upgraded me to 2nd day air, just so I would have a chance at getting the board in time for a trip. I don't even want to know how expensive that is from Germany to US.
I always read marketing materials with a big grain of salt, but antiphase tech is the real deal. Paid close attention but never noticed any discernible chatter in rough conditions. Plenty of other companies try to accomplish this with different wood core layups, various carbon stringer/sheet placements, etc... but in my experience it oftentimes just creates an overly stiff/heavy/dead zone that ultimately isn't even very effective.
Whatever sintered HD7 is, it seems to be a fast base. I was shocked how much faster it was while flat-basing on a cat track vs. my buddy on a Cardiff Bonsai. Granted it's a brand new base, but with only a single coat of basic wax. Base is already dry and edges are white after just a couple days, so it should only get faster with more coats of better wax.
So far, their Centrifugal collection takes everything I like about the Koruas & Nideckers I've owned, but without the dead door feeling that they suffer from. Might need to try the Pentaquark and/or UNW8 someday, but worried they might be too aggressive for what I prefer these days...