I recently began using these after I swapped my Beebrain BL over to the 75mm frame. They feel pretty good on this setup but I'm going to eventually upgrade the motors as well, but I'm expecting positive results from that, too.
40 mm props are all I use now !
These Azi designed props run quieter & smoother then all of my other props. They provide good thrust and give a little better flight time... For my 0802 - 25,000kv motors these props work amazingly.
I switched over to these from the HQ props because I trust the Newbeedrone brand and these did not disappoint. I have a 2s 0802 12000kv setup without the ducts. Needless to say it's rough on props in the house and out. I have yet to replace any of these while others didn't last the first turn. Keep making the hobby great newbeedrone.