I keep my customer data private, so I won't brag publicly about those who ordered but never talked openly about it. But you'd be surprised that the product that I've sold the most to "famous" musicians is the MIDIpal. Next: Braids.
You can notice a Polivoks Shruthi in Etienne de Crecy studio:
Ochre has built an Ambika
People in the chiptune scene: Nullsleep, Trash80
Porcelain Raft. Didn't know these guys but I love this video!
BT has the entire Eurorack range and seems to love Braids.
If you know more (found through interviews or studio photos...) let me know - let's stick in a first phase to artists who have a wikipedia page as a shitty metric for fame.
Also, it's obvious Richard Devine has some - but his studio is like the backup of the entire music gear industry, from which it'll be respawned in case of apocalypse