For tiny whoops weight is everything. The 75 Air frame is one option to create a light weight 75mm frame. I am enjoying mine. I migrated the motors from a Meteor65 Pro quad and use a set of 40mm propellers. Using 550 mah battery I can get a good long flight time finally.
Bought these to build a 7in 8S quad. The low kv is perfect for keeping the tip speed under Mach. These appear to be rebranded Emax EcoII, so decent quality. This quad is so powerful on 8S it's just silly. Happy Camper!