We flew my brothers AcroMaster yesterday with Hyperion Light Storm 3s1800 instead of Kokam 3200's....
Very nice, weight was only 960 grams (also 15 grams lighter carbon tubes...)
And you can buy two of these for the price of the kokams above....
We can only say: The lighter the better!
New video will follow soon
Balancing the prop is advisable, also retighten the upper and lower bolts of the motormount.