I have an Air60 V1 and an Air75 V2. Browns on the 60 and Cowberries on the 75. While I like the sound on the 75, I really dislike that in time some of the keys will begin "freeing" themselves from their hot swap sockets and I would experience every once in a while a distinctive "crunch" when I press them while typing.
Another issue is a firmware one, while I got the NuPhys for their USB dongle, they have some incompatibilities with some laptops (eg. my work issued Lenovo ThinkPad T14s Gen1) where I cannot enter the BitLocker key because the keyboard would constantly send an ever-repeating ghost keypress signal to it. Both my NuPhys do that, updated them to the most current firmware (which may actually be the part of the issue).
Other than that I have to say that the Cowberries do not feel very consistent to me, perhaps because of the above described issue with the sockets. Next on my list to try/buy would be the Lofree Flow, but man oh man... I have to start selling some of my older keyboards, they are really starting to pile up.