I tried the sl150 in the stores,,, the had a lil better bass than the sl300,,, but I like the noice canceling better on the 300... But I think the 150 will be a good buy
I have the soul sl300 just got them yesterday,,, and I also have beats studio,,, the studios have better bass,,, but the sl300 have a better all around,,, but I still have to brak in the 300