I haven’t tried the Prime. The thing looked too tall/big for my liking and I thought the airflow might be too loose for me.
My kayfun Mini clone is made by Tobeco. They were hard to come by last I looked - which was admittedly some time ago. Saw a bunch of clones recently here, but I haven’t tried any of them, nor have I ever ordered from the vendor:
Buy Kayfun Mini v3 and get free shipping on AliExpress.com
Thanks!