I have been highly disappointed with IEM. I just can't seem to find any that fit well, comfortable, and stay in place. I really don't want to buy an IEM without trying them on first. I'm selling my Beats because they don't fit well at all (I got them in a trade and regret it very much). I don't walk in the street, just out of the parking structure at work and a couple blocks on the sidewalk into my workplace.
Well , if you got the beat tours, they are well known to have fits issues.
I have no problem to insert the eph-100 and to have deep bass, but comfort might not be the best.
I think it's more easy to be disappointed with full size headphone, none have as deep bass,
and are as balanced "out of the box", without any mod or eq.