My only problem with the RF Turbine is the 30mm axle and BB92 don't leave much room for bearings. I get good millage out of GXP BB's with their larger bearings. Got 1500km on my stock Sram GXP BB. When I ran 30mm cranks in BB92 the BB would only last about 800km.
In Amurica Sram offers the new GX 6k cranks with 165mm arms, 68/73 with GXP axle. So I am trying to track a pair down.