Older turbines were about 570g for the arms and axle. assuming the 20g saving on the new ones is on the arms, brings them to 550g, still a way off the carbon ones. ERA are 415g for the arms and axle similar to next R, while next SL are around 360g with the axle.
Aeffect are about 590g ish apparently. though the difference seems noticable holding both in the hand, it may just feel that way due to how the weight is distributed between a steel 24mm axle vs alu 30mm axle.
I have aeffect on my hardtail, turbines on my FS and next SL waiting to swap out the turbines once a replacement 143.5mm axle arrives as the Q factor of the 134.5 next is a lot less than the turbines and they hit of the chainstays of my Tallboy 3.
I’ve always liked the aesthetic of the alu cranks.The SL will be my first carbon cranks. we’ll see how long they last before something comes loose.