No, I actually like the E9 for the DJ100. It's just that for ME, adding the E7 to it was like a double whammy and made my DJ100 to be too fatiguing. I'm not quite sure why.
Here's where your comment on the differing opinions is spot on...Using the E7 for my headphones made them too bright(!). Weird huh? This was with the DJ100, HD-598 and K501. Some people believe in burn in for amps/dacs and I did not do that. I don't even want to go there! I'll admit though that the E7 sounded fairly clear and did not seem to change the mids of the DJ100 at all, which is a positive for me sometimes. The E7 is supposed to be fairly neutral sounding too. I don't know what the heck was going on with my E7, but based on reviews, people can't agree on how it's treble sounds!
The Icon Mobile sure isn't built that well. The cover alone seems to fall off every time I drop it from 5". Luckily it's held up fairly well despite that. I do like how small it is. I had an Ipod Touch leather case and would always attach it to the back of the cover flap. Seemed like the perfect combination. Doesn't have enough power to drive an HD-650 though. E11 probably could
One of my favorite matches for the D2/5/7 is the E9, so we obviously have different opinions lol.
I will get on board with the E7 feelings though. I didn't like the E7 much at all when I had it as it just made everything sound dark. I liked the sound of the Icon Mobile more, but returned that one because the build quality was awful.
I do really need to get some M50 pads for mine though as the stock ones are pretty terrible.
Oh, and I agree with you iPod touch comment as well. Seems that from my netbook or iPhone directly they're more bassy than when properly amped.