Yes, people do speak highly of the ER4s isolation. Happy listening / cycling!
that's a big statement , as the eq-5 were selling for 200-250$
i used to own a pair of eq-5 and i really liked them , although they were a little 'hot' in the highs - which was hat led me to sell them
i will try tomorrow RE-400 , i am intrigued even more to see how these sound
It's personal preference, of course, but I can't think of one thing I prefer with the eq-5. The re-400 make them sound positively 2D and dry.