Well, the E5's came in late today. I've been listening to them for about an hour, and I'm pretty impressed. First off, they're much more difficult to insert and get a good seal with than the E3's IMO. I'm probably going to take a little time to get better at putting them on. Secondly, and most importantly, they sound like what I hoped my E3c's would sound like. The sound signature is very similar, but it sounds more full than the E3c. I originally tested it out of my iPod. I could tell a slight difference between the E5 and the E3c, but not as drastic as I was hoping. Realizing that this wasn't the best situation for a comparison, since my iPod is only loaded with APS MP3's, I tried it out on my old PCDP. Wow, what a difference! This is the first phone I've ever used that could easily expose the MP3 format for what it is. I noticed a drastic change in frequency response with the E5's through a CD player. Everything, and especially the lower range, seemed to extend much better. The MP3's were lifeless and much less exciting in comparison. As for bass response, I find it to be much improved over the E3c's (especially through the CD player). Well, those are my very early impressions. So far, so good.