I've looked at the Westone site and the specs for their UM-1 and UM-2 (similiar in appearance to the Shure E1 and E5), and as close as they look, heck they are the same EXACT housing, I don't think they are the same headphones. The impedances and frequency responses are different enough (very different on the UM-2 and E5-- 27 ohms versus 110 ohms!), that I don't think I would chance getting the Westones without a good return policy, as I fear they might not compare to their Shure counterparts.
Mariowar--- glad I could help out! I don't think anyone on these boards will call them Ety killers (though they are for me--- cheaper, excellent sound, alot less microphonic than even the ER6), I think they are an excellent value at $119. You're gonna love 'em!
appar111