Bought steam 105s with a full bed of 4G. I broke it after about 5 hours and I just replaced it with a full bed of ALU power and MAN, it is nice.
Compared to ALU, 4G felt dull. ALU feels better and the spin production is superior to 4G. The way Steam is eating up the strings, tension maintenance over long time does not matter to me. I am going to stay away from 4G.