How do you like your ER4-Ps? I have a pair of ER-6s on the way to me ... maybe by this weekend if I'm lucky.
The isolation on them is phenomenal, which makes them excellent for stealth monitoring in the field. You'd never guess that earbuds could sound as good as closed headphones. However, my ear canals are constructed so I have to jam those suckers in but good to get the isolation. It's enough to be uncomfortable for extended periods, as noted in
this review, which is why I like my
Fontopias that look similar to the construction of the ER-6s.
Plus, at $330 I'm a wuss about the Etymotics. Even though I know they're rugged, I tend to baby them. I've been known to accidentally rip out the cord on earbuds so I wouldn't feel as guilty about killing or losing the Sonys. I'm bass-thirsty and the bass response is great but there's no way to get the isolation you have with the Etymotics. As soon as the Fontopias meet their end, I may have to get the ER-6s. They look sweet.
Charles, you may want to read through
these threads. They helped me decide on mine.