Get them!! You won't be dissapointed. They are easily driven by my Iphone 6, and Sony DAP, with the volume a tad higher than normal. I am wondering about custom molds myself. I use tri-flanges as they provide the best fit out of the included tips, and (to me) best sound quality. However I almost never seem to have the perfect fit, or it takes multiple insertions. Would custom molds possibly fix this issue while keeping the same audio quality? I know they can be expensive as well.